You'll probably spot Navy Cathedral of St. Nicholas from a distance before you actually find this incredible place of worship. Take a seat inside if the doors are open or just admire the facade from the street.
You'll soon learn why this Kronshtadt principal church is visited by many travelers. If you're looking for more to explore, Kronstadt Fortress, Petrovsky Park, and Kronstadt Lighthouse are in this area too. They won't take long to reach from Navy Cathedral of St. Nicholas.