St. Isaac's Cathedral
Now serving as a museum, this cathedral was built for Saint Isaac, a patron saint of Peter the Great.
Savior on the Spilled Blood
One of the city's major attractions, Savior on the Spilled Blood was once a Russian Orthodox church, but has been repurposed as a museum. The "Spilled Blood" in the name refers to the assassinated Emperor Alexander II in 1881.
State Hermitage Museum
Founded by Catherine the Great, this complex of several buildings comprises the world's second-largest art museum (after the Louvre).