Built in 1912 and listed on the National Register of Historic Places, St. Theodosius Cathedral is one of Cleveland's most iconic landmarks. It is home to an Orthodox Christian parish originally founded by Austria-Hungarian immigrants in 1896. Architect Frederick C. Baird designed it in the Neo-Byzantine style and as such, features the distinct elements of the style, most notably the onion domes located at the top of the building. It is considered one of the finest Orthodox Christian churches in the country. Over time, congregants moved to the suburbs and elsewhere in northeast Ohio and established Orthodox parishes. For this reason, St. Theodosius is considered the mother church of these other parishes.
Interestingly, it is speculated that Czar Nicholas II of Russia provided some funds for the church's construction (it was the first Orthodox church built in Cleveland). Tragically, the Czar and his family were murdered in the Bolshevik Revolution in 1917. The church is also famous for its appearance in the 1978 film The Deer Hunter starring Robert DeNiro, Christopher Walken, and Meryl Streep.