Because it was built on the spot where Tsar Alexander II was assassinated in 1881, this church is popularly known as the Church on Spilled Blood. (It's also called the Church of the Resurrection, Church of the Savior on the Blood, Resurrection of Christ, Assumption, and Church of the Redeemer. But somehow everyone always understands what you're talking about.)
The flamboyant exterior is supposed to represent the nation's grief at losing their Tsar.
Situated just off of Nevsky Prospekt, it takes your breath away when you first spy it from the bridge over the Griboyedova canal.
The interior of the church is decorated with different marbles and several zillion mosaic tiles.
After the October Revolution the church was closed, briefly used for a propaganda exhibition, and then for potato storage before being allowed to fall into decay. The Communists saw it as an "inappropriate" symbol of Christianity in a largely atheistic society.