The Dormition (Uspenskiy) Cathedral in Vladimir is an outstanding monument of white-stone architecture of pre-Mongol Russia (the 12th century). Today, it is the cathedral of the Russian Orthodox Church and the National Museum. http://russiatrek.org/blog/travel/the-dormition-cathedral-in-vladimir/

This Church was built on the site where Emperor Alexander II was severely wounded and died in March 1881.The church was built from 1883 till 1907. The construction was funded by the imperial family. Architecturally, the Cathedral differs from St. Petersburg's other structures. The Church contains over 7500 square meters of mosaics—according to its restorers, more than any other church in the world. The walls and ceilings inside the Church are completely covered in intricately detailed mosaics — the main pictures being biblical scenes or figures — but with very fine patterned borders setting off each picture. http://www.visit-petersburg.ru/en/showplace/195645/