You might want to spend some time browsing the exhibits at Military History Museum of Artillery, Kirov Apartment Museum, or Museum of the Defense and Siege of Leningrad. Peter and Paul Fortress, Palace Embankment, and First Engineer Bridge are monuments to see when you're exploring the area around State Museum of the Political History of Russia. You can watch performances at Bolshoi Saint Petersburg State Circus, Alexandrinsky Theatre, and Leningrad Center if you're interested in local theater.