More than 180 feet high, the Sobakina (formerly Arsenal) Tower at the northernmost part of the thick battlements that encircle the Kremlin was an important part of the Kremlin's defenses. It was built in 1492 and its thick walls concealed a secret well, which was of vital importance during times of siege. It isn't open for touring.
ul. Manezhnaya, Moscow, 119019, Russia