Uspenski Cathedral is an Eastern Orthodox cathedral in Helsinki, dedicated to the Dormition of the Theotokos (the Virgin Mary). Designed by the Russian architect Aleksey Gornostayev, the cathedral was built after his death in 1862–1868.
Savonlinna Cathedral was built in 1874-1878, and dedicated in 1879. It was designed by A. Dahlstrom. The church was severely damaged during the Second World War, and reconstructed in 1947-1948. The Baroque-style organ is from the renovation in 1990-1991.
The history of St. Jacob's Church in Paimio dates back to medieval times. The present church was designed by Lars Sonck, and was built in 1928. It replaced an earlier church which was built in 1806 and destroyed by fire in 1909.
The Church of Holy Trinity was built in 1825-1826, and dedicated in 1827. It was designed by Carl Engel in the neoclassical style. The Church of Holy Trinity is located next to the Helsinki Cathedral, and it is the oldest Orthodox church in Helsinki.