The large and richly decorated Russian Orthodox church, designed in a mixed historicist style, was completed on Toompea Hill in 1900, when Estonia was part of the Czarist Empire. The well-maintained cathedral is one of the most monumental examples of Orthodox sacral architecture in Tallinn. Tallinn’s most powerful ensemble of church bells is located in the church towers. It comprises 11 bells, including Tallinn’s largest bell, which weighs 15 tonnes. Carillons by the entire ensemble can be heard before services. The interior, which is decorated with mosaics and icons, is worth a visit.