Kronstadt Fortress - Credit: Wikimedia Commons
The Kronstadt Fortress is an architectural and historical monument of the 18th–19th centuries in Saint Petersburg, Russia. Only the Northern Wall of the fortress, located in the center of Kronstadt along Vosstaniya Street, which was built in the 19th century along the already existing, but not long before, rebuilt fortress, has survived in good condition. Read more on Wikipedia
Source: en.wikipedia.org