And speaking of Moscow, we can't pass by the Moscow underground world. A hidden city, as massive underground as it is above it. Beautiful, quirky, mysterious underground of Moscow hides many secrets and is shrouded in many legends, up to 8 levels under the city. However, underground Moscow is also full of dangers in the form of collapses, aggressive people and other elements. The bowels of Moscow for nine centuries of its existence were many times dug to a great depth. Of the well-known Moscow dungeons, except for the semi-legendary Metro-2 and the library of Ivan the terrible, you can name the stone-bound Neglinka river and the basement system of an apartment building on Solyanka. In any case, there are many dangers that can harm or endanger your life. You can go down here at your own risk.
The most legendary secret of the Kremlin's dungeons is the library of Ivan the terrible, whose fame thundered throughout Europe during the Tsar's lifetime. Notable foreign guests specially came to Moscow to get acquainted with this or that folio from a unique collection. The Foundation of the library was apparently a collection brought by the Tsar's grandmother Sophia Palaiologos. She was descended from the Byzantine Imperial Palaiologos dynasty, and was a niece of the last Byzantine Emperor, Constantine XI Palaiologos. That is, the library was collected in Byzantium a few years before the fall of the Empire. However, in 1601, 17 years after the owner's death, the library disappeared. Most historians assume that it is located in the dungeons of the Kremlin.