We arrived back in St. Petersburg just in time to tour The Church on the Spilled Blood. This magnificent, brightly colored, onion-domed church was built by Alexander III to mark the exact spot where his father, Alexander II, was assassinated. Both the exterior and the interior of the church are covered with beautiful mosaics. The altars in the church are carved from precious gemstones. Craftspeople knew they had produced a masterpiece when the stones appeared wet.