The Monument to Nicholas I is a bronze equestrian monument of Nicholas I of Russia on St Isaac's Square (in front of Saint Isaac's Cathedral). Unveiled on June 25, 1859, the statue was a technical wonder of its time; it spans six meters and was the first equestrian statue in the world with merely two support points (the rear hoofs of the horse).

We all have on those stupid stickers because you can't enter Russia without a Visa unless you're with a tour group. The colored stickers are for the group you are with.