The Church of the Savior on Spilled Blood is a former Russian Orthodox church in Saint Petersburg, Russia which currently functions as a secular museum. The structure was constructed between 1883 and 1907. It is one of Saint Petersburg's major attractions.

The church was erected on the site where political nihilists assassinated Emperor Alexander II in March 1881. The church was funded by the Romanov imperial family in honor of Alexander II, and the suffix "on Blood" refers to his assassination.

Construction began in 1883 during the reign of Alexander III, two years after the assassination of his father Alexander II. The church was dedicated to be a memorial to his father. Estimates suggest that the construction cost 4.5 million rubles. The construction was completed during the reign of Nicholas II in 1907. Funding was provided by the Imperial family with the support of many private donors.

Architecturally, the cathedral differs from Saint Petersburg's other structures. The city's architecture is predominantly Baroque and Neoclassical, but the Savior on Blood harks back to medieval Russian architecture in the spirit of romantic nationalism. It intentionally resembles the 17th-century Yaroslavl churches and the celebrated St. Basil's Cathedral in Moscow.

The church contains over 7500 square meters of mosaics-according to its restorers, more than any other church in the world. This record may be surpassed by the Cathedral Basilica of St. Louis, which houses 7700 square meters of mosaics. 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.

 According to wikipedia.org