Erarta Museum and Galleries of Contemporary Art, Pushkin Flat-Museum, and C-189 Submarine Museum feature a variety of fascinating exhibits to see while you're in town. St. Isaac's Cathedral, Admiralty Building, and Menshikov Palace are notable landmarks to explore if you're in the area. You can watch performances at Mariinsky Theatre, Alexandrinsky Theatre, and Oktyabrskiy Big Concert Hall if you're interested in local theater.