Храм Христа Спасителя (Church of Christ the Savior): Moscow, Russia
An interesting tale: When Joseph Stalin came to power, he had this church (along with many, many others) destroyed. He planned to build an enormous soviet style building, topped with an oversized statue of Lenin (on which the pinky finger was to be 10 feet long, it’s said), but it sank into the ground (this church is located on the banks of the river Moscow). Thwarted, Stalin ordered the building of the world’s largest swimming pool, which he then heated during the winter and closed during the summer. The church that stands today is a replication of the church that once stood before the Stalinist shenanigans.