C-189 Submarine Museum, Erarta Museum and Galleries of Contemporary Art, and Pushkin Flat-Museum feature a variety of fascinating exhibits to see while you're in town. Sights like Yusupov Palace, Mariinsky Palace, and St. Isaac's Cathedral are must-sees while exploring the area. You can watch performances at Mariinsky Theatre, Alexandrinsky Theatre, and St. Petersburg Philharmonia if you're interested in local theater.