Everyone has seen this church, known in Russian as Spas na Krovi. Even if only when playing Tetris, it's one of the best known Russian landmarks. It should, however, be pointed out, that Peter the Great must have been turning in his grave as it was being built in his 'European city'! Stand between the church and Kazan cathedral on Nevsky and compare the architectural influences!
It was build by Aleksandr III to commemorate his father Aleksandr II who was assasinated where the church now stands. He was so determined that the altar would be on the very spot that his father was killed that the church was built jutting out into the canal.
It was not completed in time to be used as a church for long, and the Communists just ignored it and allowed it to fall into disrepair. It has not been restored and is the most incredible thing I've ever seen! It's even more ornate inside than out, full of mosaics depicting Bible scenes, right up into the domes.