Исаакиевский собор
Isaakievsky pontoon bridge (Saint Isaac's Bridge) was the first bridge across Neva river in St.Petersburg, by then the capital of Russian Empire. It was first constructed in 1727. Starting from 1732 it was rebuilt each summer for a period 184 years. The bridge was named after the nearby Saint Isaac's Cathedral. Between 1856 and 1912 construction was shifted to the spot of today's Palace Bridge.