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The Rostral Columns are located
in St. Petersburg on the Spit of St. Basil Island.
They are ancient "lights" built in 1811 to guide
ships in St. Petersburg which is a city of islands
in the Neva river. The city has 150 bridges, 9 of
them drawbridges, which allow entry of ocean-going
ship into the waterways and canals of the city.
These bridges are opened at 2am for ship traffic
to pass but remain closed (down) during the day
so traffic is not impeded.