Nikolskaya Tower in Moscow Kremlin

Nikolskaya Tower stands in the northern section of the Moscow Kremlin wall, which comprises some of the city's oldest surviving structures. Named after St. Nicholas, the tower was originally built in 1491 by Pietro Antonio Solari (1445–1493). Several modifications were made in the centuries that followed, including the addition of Gothic elements. Until the October Revolution, the eponymous icon of St. Nicholas adorned the entrance of the building. However, it was damaged and never restored. A red Soviet star has topped the tower spire since 1937.

Moscow Kremlin, Nikolskaya Tower, color photography, 2014, photographer: Ludvig14; source: Wikimedia Commons, Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).