Location: 11 South Castillo Dr, St. Augustine, Florida Map
Constructed: 1672
Castillo de San Marcos or Castle of Saint Mark is situated at 11
South Castillo Dr, St. Augustine, Florida in United States. The city
of San Agustín was founded by Spain in 1565. During its first
century of existence, nine wooden forts defended the position. After
the attack of the English pirate Robert Searle in 1668, it was
decided to build a stone castle to protect the city. The
construction of Castillo de San Marcos began on October 2, 1672 by
the Spanish army when it was part of the Spanish Empire.
Castillo de San Marcos is a star shaped fortification built with
coquina, a variety of limestone. The workers were brought from
Havana, Cuba. The coquina was extracted from Anastasia Island, on
the other side of the bay, and taken on boats to the construction
site. In 1695, after twenty-three years of hard work, the fortress
was ready.
Spain founded St. Augustine in 1565 under Pedro Menéndez de Avilés,
the first permanent European settlement in what is now the United
States. For over a century, the town relied on nine successive
wooden forts for defense against pirates, privateers, and rival
European powers. A devastating raid in 1586 by Sir Francis Drake
burned much of the settlement. The decisive trigger came on May 28,
1668, when English privateer Robert Searles (also known as John
Davis) sacked St. Augustine, looting and burning the town while the
wooden fort offered little protection. This raid, combined with the
recent English founding of Charles Town (Charleston) in 1670—just a
short sail away—convinced Spanish authorities that a permanent stone
fortress was essential to protect Florida, the treasure fleets, and
Spanish claims in the New World. Queen Regent Mariana of Spain
approved funding, and construction was ordered after the raid.
Construction (1672–1695) and the “Rock That Saved St. Augustine”
Governor Manuel de Cendoya oversaw groundbreaking on October 2, 1672
(under the design of Spanish engineer Ignacio Daza). The project
took 23 years and cost enormous sums, funded by the Spanish crown
and New Spain (Mexico). Laborers included Native Americans from
nearby missions, enslaved Africans, convicts, and skilled masons
from Havana. Over 75,000 tons of stone were quarried.
The
material chosen was coquina (“tiny shell” in Spanish), a porous
limestone formed from ancient coquina clam shells cemented by
calcium carbonate during the last ice age. Quarried on Anastasia
Island (just across Matanzas Bay), it was the only local stone
available. Engineers initially doubted its strength and built walls
extraordinarily thick—averaging 12 feet (up to 19 feet on the
seaward side)—using oyster-shell lime mortar. Unexpectedly, coquina
proved brilliantly effective: its millions of microscopic air
pockets allowed it to compress and absorb cannonball impacts like a
sponge, causing balls to embed or bounce off rather than shatter the
wall (unlike brittle granite or brick). This property would save the
fort repeatedly.
Design and Architecture: A Vauban-Style
Masterpiece
The Castillo is a classic example of 17th-century
European bastion fortifications (influenced by French engineer
Vauban). Its star-shaped layout features four diamond bastions (San
Pedro, San Agustín, San Carlos, San Pablo) connected by curtain
walls, a ravelin protecting the sally port (main gate), a dry moat
(floodable with seawater), and a glacis (sloped earthwork) that
forced attackers uphill into cannon fire. Embrasures allowed cannons
on the terreplein (gun deck) and muskets below. The design maximized
crossfire while minimizing blind spots, making direct assault nearly
impossible. It could shelter over 1,500 people and withstand
prolonged sieges.
Colonial Sieges: Proof of Strength (1702
and 1740)
The fort faced its greatest tests during Anglo-Spanish
wars.
Siege of 1702 (Queen Anne’s War / War of the Spanish
Succession): English forces from Carolina under Governor James Moore
(~1,500 men, nine ships, Native allies) attacked in
November–December. About 1,500 Spanish civilians and soldiers
sheltered inside. English cannons and mortars proved useless against
coquina walls. A Spanish relief fleet from Havana arrived on
December 26; Moore burned his ships and retreated overland,
partially destroying the town but failing to take the fort.
Siege
of 1740 (War of Jenkins’ Ear): British General James Oglethorpe
(Georgia founder) led a larger force with naval support. He
bombarded the Castillo for 27–29 days from May to July. Again,
coquina absorbed the punishment—“as though you would stick a knife
into cheese.” Spanish repairs at night, privateers, and a threatened
Cuban relief force forced Oglethorpe’s retreat due to supply
shortages and disease. The fort stood unbreached.
In its
entire history under multiple flags, the Castillo was never captured
by assault—only transferred by treaty.
Ownership Changes:
Five Peaceful Transfers
First Spanish Period (1695–1763): Primary
defensive stronghold.
British Period (1763–1783): Ceded via
Treaty of Paris after the Seven Years’/French and Indian War.
Renamed Fort St. Mark. Used as barracks, supply depot, and prison
during the American Revolution (holding Declaration of Independence
signers and patriot Christopher Gadsden). St. Augustine became a
Loyalist haven.
Second Spanish Period (1783–1821): Returned via
Treaty of Paris after the American Revolution. Minor maintenance
only.
U.S. Period (1821–present): Acquired via Adams-Onís Treaty.
Renamed Fort Marion in 1825 after Revolutionary War hero Francis
Marion. Served as coastal defense, barracks, and notably a military
prison.
During the Civil War (1861–1865), Confederates
briefly held it without combat; it returned to Union control.
Prison Years Under U.S. Control (19th Century)
After its
defensive role ended, Fort Marion became a notorious prison:
Seminole Incarceration (1837, Second Seminole War): Following the
Indian Removal Act, over 230 captured Seminoles (including war
leader Osceola and Coacoochee/Wild Cat) were imprisoned here after a
deceptive truce. Conditions were harsh (crowded cells, illness). On
November 29, 1837, Wild Cat and ~19 others escaped through a high
embrasure using a rope, prolonging the war. Osceola was later
transferred and died at Fort Moultrie. Many Seminoles trace heritage
to these “Unconquered” escapees.
Plains Indians (1870s): ~74
Cheyenne, Arapaho, Kiowa, Comanche, and Caddo prisoners were held.
They created famous “ledger art” (drawings on ledger paper)
depicting their lives and battles—now a significant Native artistic
legacy.
Apache Prisoners (1886–1887): Over 500 Chiricahua and
Warm Springs Apache (including some from Geronimo’s band) were
imprisoned here after surrender. At least 24 died; their remains
were later repatriated.
These uses reflect the fort’s shift
from protector to instrument of U.S. Indian policy.
20th
Century to Present: Preservation and National Monument
Decommissioned as a military site in 1899, it was designated a
National Monument in 1924 (as Fort Marion), transferred to the
National Park Service in 1933, and officially restored to its
original Spanish name Castillo de San Marcos by an Act of Congress
in 1942 to honor its history. Minor restorations and preservation
work continue (e.g., cannon conservation). In 1964, the grounds
hosted civil rights gatherings. Today it draws hundreds of thousands
of visitors annually, interpreting Spanish colonial, Native
American, African American, and American stories. It is also a
Historic Civil Engineering Landmark.
Overall Layout and Star-Shaped Bastion Design
The fort centers on
a nearly square plaza (sides measuring approximately 320 feet) with
four diamond-shaped (or angle-shaped) bastions projecting outward at
each corner: San Pedro, San Agustín, San Carlos, and San Pablo. Each
bastion features a sentry box (garita) at its tip for lookout and
signaling. The curtain walls connecting the bastions are straight
segments pierced by embrasures (openings) for cannons and muskets.
This star-shaped plan—originating in 15th-century Italy and refined
in the Vauban style—eliminates "dead zones" or blind spots.
Geometric principles ensure that cannons on any bastion or curtain
wall can enfilade (rake with crossfire) attackers approaching any
face or corner. The bastions allow overlapping fields of fire: an
enemy assaulting one wall comes under direct or angled fire from
adjacent bastions.
Materials and Construction Techniques: The
Role of Coquina
The fort's walls and structures use coquina, a
rare porous limestone formed from compressed seashells (primarily
coquina clams) quarried on nearby Anastasia Island. Blocks were cut
by hand—over 400,000 in total—and laid with mortar made by burning
oyster shells into lime, then mixing with sand and water. The
exterior was originally coated with lime stucco for weather
protection and a smoother finish.
Coquina's physical properties
make it uniquely suited (and ironically ideal) for fortifications
despite its softness: it contains millions of microscopic air
pockets, making it compressible like Styrofoam. Cannonballs burrow
into or embed in the stone rather than shattering it, absorbing
impact energy. Walls average 12 feet thick (up to 19 feet on the
seaward side), rising 30 feet high (base 10–14 feet thick, tapering
to 5 feet at the top). This "forgiving" material withstood prolonged
British bombardments in 1702 and 1740 without breaching.
Construction progressed slowly due to labor (Spanish artisans,
convicts, Indigenous workers, and slaves) and the novelty of
large-scale coquina masonry. The main block was largely complete by
1686 (outer walls in coquina, interiors initially wood), with full
completion around 1695. The terreplein (gun deck) originally used
wooden beams and tabby (seashell-lime concrete), but these rotted;
in the 1730s–1750s, engineer Antonio de Arredondo replaced them with
bomb-proof stone vaulted arches (casemates).
Defensive
Features: Bastions, Gun Deck, and Outerworks
The terreplein
(wide, flat gun platform atop the walls) supports heavy cannons
firing through embrasures in the parapet. Lower levels include
musket slots. The design integrates infantry and artillery
seamlessly.
Outer defenses form a complete system:
Moat —
A 42-foot-wide, coquina-lined dry ditch (originally encircling most
sides; east side later filled). It could be partially flooded with
seawater.
Ravelin — A triangular masonry outwork in the moat,
directly protecting the south-side sally port (the fort's only
entrance). It mounts its own cannons and includes a powder magazine;
access is via drawbridge.
Glacis and Covered Way — A sloped earth
rampart (glacis) beyond the moat forces attackers uphill, exposing
them to plunging fire. The covered way (protected path between moat
and glacis) allows defenders to maneuver safely.
Later additions
(18th–19th centuries) include the Cubo Line palisade, City Gate,
seawall, and east-side water battery for harbor defense.
Interior Architecture and Functional Spaces
Inside the plaza
(parade ground) are vaulted casemates—arched, bomb-proof rooms
beneath the terreplein—used for troop quarters, a chapel,
storerooms, wells, ovens, and a powder magazine. These were enlarged
and arched in the 1730s–1750s for strength and habitability
(original flat wooden ceilings failed under the weight of guns and
weather). The sally port leads into this courtyard via drawbridge
from the ravelin.
Evolution, Modifications, and Architectural
Significance
Early plans (1675) show a simpler version; by 1763
the vaults, taller walls (raised ~5–7 feet), and completed
ravelin/glacis were in place. British and U.S. periods added minimal
changes (e.g., water battery in the 1840s), preserving the Spanish
core. The fort was never taken by direct assault, proving the
effectiveness of its design and materials.
As the sole extant
example of 17th-century bastioned masonry in the U.S.—and one of
only two coquina forts worldwide (with nearby Fort Matanzas)—it
bridges medieval castles and modern coastal defenses. Its adaptation
of European engineering to local resources and colonial threats
makes it a masterpiece of military architecture and a testament to
Spanish colonial ingenuity.
The Star-Crossed Lovers (The Woman in White or Perfume Ghost)
One
of the most romantic and tragic tales involves Colonel García Martí
(or Garcia Marti), commander in the late 1700s (around 1784 when
Spain regained the fort). He brought his young, vivacious wife
Dolores (sometimes linked to or confused with Maria Mancilla in
variants). Dolores befriended (and allegedly romanced) the colonel's
aide, Captain Abela (or a young officer named Manuel in other
tellings). The colonel noticed her perfume on the captain's uniform,
exposing the affair.
According to legend, Martí had the lovers
secretly chained and walled up alive in a hidden dungeon chamber (or
immured in a storage room). He claimed they had been sent away—Abela
to Cuba, Dolores to Mexico. Decades later (around 1833 in some
accounts), a curious soldier or architect discovered the hollow
wall, revealing two chained skeletons and a lingering sweet perfume.
Hauntings: Dolores appears as a "Woman in White" (or flowing blue
gown in some versions) gliding through corridors and ramparts,
whispering or calling out. Visitors report her perfume wafting in
the secret room or near dungeons, shadowy figures of a young couple,
anguished whispers, and a sense of sorrow. A related "Screaming
Woman" legend may tie in—her cries echo in coquina halls at dawn or
dusk, possibly from betrayal or unjust imprisonment. A young man's
apparition sometimes stands on the ramparts gazing seaward. Some
sources describe them as eternally seeking each other.
Spectral Spanish Soldiers and the Lost Company
Spanish colonial
troops dominate sightings. The most specific is Captain Domingo
Martinez, who died defending the fort during the 1702 British siege
(Queen Anne's War). He appears solid on the gun deck at
sunset—uniformed, casting shadows, overlooking Matanzas
Bay—accompanied by phantom commands, gunpowder smells, and leather.
Rangers and visitors have tried speaking to him before he vanishes.
Broader apparitions include Spanish sentries (the "Phantom
Watchmen") marching ramparts or running hallways, shadowy figures in
watchtowers, and cannon crews. Sounds of drills, artillery, or
battle shouts arise on quiet nights or during thunderstorms.
The
eerie Lost Company legend: In 1784 (during renovations), a group of
Spanish soldiers was accidentally sealed alive in a storage room.
Discovered years later as skeletons still clutching weapons, their
collective spirit now marches in formation through
corridors—especially pre-dawn—sounding like multiple boots on stone.
Experiences: Full-body apparitions on battlements, electronic
malfunctions near trauma sites, and security footage of
period-dressed figures in off-limits areas.
Seminole and
Native American Spirits (Including Osceola)
The fort imprisoned
hundreds of Native Americans during the Seminole Wars (1830s–1850s,
as Fort Marion). Conditions were brutal: windowless cells, disease,
and death far from home.
Chief Osceola (captured 1837 under truce
flag) is central. Legends claim his spirit lingers in the northwest
bastion or courtyard—proud in traditional dress, radiating dignity
and sadness. Some describe a floating head or headless warrior
searching for his stolen head (historically removed post-mortem by a
doctor at Fort Moultrie, SC, where he actually died in 1838; the
fort's legend adapts this). He reportedly communicates
telepathically with visions of his people's suffering and U.S.
betrayal.
Other Seminole prisoners appear as shadowy figures or a
leaping apparition jumping from high walls (symbolizing escape
attempts). A general "headless chief" or soldier paces ramparts.
Visitors feel overwhelming sadness and dread in dungeons, where
Native ghosts are sensed.
Dungeon Hauntings: Prisoners, the
Warden, and Screams
The subterranean casemates/dungeons housed
British prisoners (Queen Anne's War), Confederates (Civil War),
pirates, and Natives. Many died in chains from disease or cruelty.
Phenomena: Cold spots (drops of 15–20°F), rattling chains in empty
cells, pleading voices, moans, EVPs in Spanish, and an oppressive
"watched" feeling. A "stern Warden" apparition in colonial uniform
patrols, keeping order. One psychic reportedly suffered a physical
attack by a prisoner's spirit during an investigation.
Specifics
include British pirate Andrew Ransen (executed here) and anonymous
Confederate/British souls. A "ghostly figure jumping from walls" or
phantom lights in the watchtower add to the dread.
Other
Phenomena and General Activity
Headless Soldier: Paces ramparts,
evoking battle executions.
Phantom lights from the watchtower,
like ghostly patrols.
Indentations on old cots (as if someone
lies there), pushes near powder rooms, and bootsteps in empty halls.
Activity peaks at night; thunderstorms trigger "cannon fire" echoes.
The fort's thick coquina walls are said to "trap" energy from
centuries of conflict, imprisonment, and betrayal.
Visiting
Tips: Explore daytime via NPS tours for history, then join evening
ghost tours (e.g., from Ghost City Tours, Ghosts & Gravestones, or
St. Augustine Ghost Tours) for legend-focused access. Paranormal
investigations require permits. Bring cameras for orbs; expect
battery drain and chills. The site is family-friendly by day but
eerie after dark.