On a sightseeing tour of St. Petersburg you can see:
Palace Square
Hermitage
Admiralty
Senate Square
Saint Isaac's Cathedral
St. Isaac's Square
Mariinsky Palace
Stroganof Palace
Kazan Cathedral
Zinger House
Church of St. Catherine
Church of the Savior on Spilled Blood
Art Square
Mikhailovsky Castle
Champ de Mars
Summer garden
Trinity bridge
Peter and Paul Fortress
Cathedral Mosque
Cruiser Aurora
Spit of Vasilyevsky Island
Palace Bridge
Gostiny Dvor
Malaya Sadovaya street
Anichkov bridge
Palace of Beloselsky-Belozersky