This is Fort Konstantin, in Kronstadt. This fort is one of the largest artillery forts of Kronstadt, built in the 19th century. It was the site of fighting in the Revolution and the Kronstasdt Rising, and also in WW2 during the siege of St Petersburg.
Kronstadt, sometimes spelled kronshtad, is an island in the gulf of finland off the russian coast near to st petersburg.
Since the time of peter the great it has been a military island, with a massive naval base. There is amazing architecture and a complex system of forts, locks and canals.
When i was there in 2004-4 it was in severe decay… Here is the first of several series I shot there. These are just the digital photos.