10. Winter Palace, St. Petersburg, Russia
The Winter Palace in Saint Petersburg, Russia was the official residence of the Russian Tsars. It was designed by many architects, most notably Bartolomeo Rastrelli, in what came to be known as the Elizabethan Baroque style; the green-and-white palace has the shape of an elongated rectangle. The palace has been calculated to contain 1,786 doors, 1,945 windows, 1,500 rooms and 117 staircases. Its principal façade is 250 m long and 100 ft high.