7. The Church of Our Savior on Spilled Blood
In Saint Petersburg, Russia, it is built on the site where Emperor Alexander II was mortally wounded and died in 1881. Its interiors and exteriors are decorated with detailed mosaics. It was closed for services in the 1930s when the Bolsheviks destroyed the churches. After over 30 years of restoration, it was reopened to its former glory in the year 1997.