☦ Alexander Nevsky Cathedral in Sofia - Sofia, Bulgaria Cathedral of St. Alexander Nevsky is a Bulgarian Orthodox cathedral in Sofia, the capital of Bulgaria. Built in neo-Byzantine style, it serves as the cathedral church of the Patriarch of Bulgaria and is one of the largest Christian church buildings in the world by volume. This is one of the symbols of Sofia and the main tourist attractions. St. Photo: Jose Ligero Loarte · CC BY-SA 4.0