Study the collections at Grand Maket Russia Interactive Museum, C-189 Submarine Museum, or Erarta Museum and Galleries of Contemporary Art. Narva Triumphal Arch, St. Nicholas' Naval Cathedral, and Saint Petersburg Conservatory are landmarks that you won't want to miss. You can watch performances at Mariinsky Theatre, Rimsky-Korsakov Conservatory, and Bryantsev Youth Theatre if you're interested in local theater.