Fort No3 northern
The third island fort in the northern part of the Kronstadt Fortress, if you count from Kotlin Island. It was founded in 1865-70. Currently, it is part of the dam, fenced with a enclosure, behind which some work is being carried out. Apparently, the fort will soon turn into some kind of fashionable outlet with shops, casinos, blackjack and hookers. That, perhaps, won't be bad...