This is one of the
two entrances to Moscow Kremlin, another being Borovitskaya Tower.
Constructed in 1495- 99 it is tallest of the Kremlin towers.
Tower owes its name to Trinity Monastery of Saint Sergius that
once had a mission near its gate. In 1516 it was linked by
bridge to Kutafya Tower over Neglinnaya River that once
ran through Alexandrovsky Garden. It is now buried underground
leaving the bridge seem useless. It was used as an entrance for
the patriarchs as well as tsars' wives, daughters and other