You might want to spend some time browsing the exhibits at Alexander Pushkin Museum and Memorial Apartment, Pushkin Flat-Museum, or Erarta Museum and Galleries of Contemporary Art. Admiralty Building, St. Isaac's Cathedral, and State Hermitage Museum are landmarks that you won't want to miss. You can watch performances at Mikhailovsky Theatre, Mariinsky Theatre, and St. Petersburg Philharmonia if you're interested in local theater.