You might want to spend some time browsing the exhibits at Grand Maket Russia Interactive Museum, C-189 Submarine Museum, or Rumyantsev Mansion. Narva Triumphal Arch, Moscow Triumphal Gate, and Yusupov Palace are landmarks that you won't want to miss. You can watch performances at Mariinsky Theatre, Tovstonogov Bolshoi Drama Theater, and Alexandrinsky Theatre if you're interested in local theater.