The St. Alexander Nevsky Cathedral - Credit: Wikimedia Commons
St. Alexander Nevsky Cathedral (, Hram-pametnik "Sveti Aleksandar Nevski") 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 it is one of the 50 largest Christian church buildings by volume in the world. It is one of Sofia's symbols and primary tourist attractions. Read more on Wikipedia
Source: en.wikipedia.org