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The Cathedral in Varna is the biggest Christian church there.
Alexander Nevsky Cathedral, Sofia
The 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 is one of the largest Eastern Orthodox cathedrals in the world, as well as one of Sofia’s symbols and primary tourist attractions. The St. Alexander Nevsky Cathedral in Sofia occupies an area of 3,170 square metres (34,100 sq ft) and can hold 10,000 people inside. (Info: Wikipedia)
Spherical panoramas from Wonder bridges- rock formation phenomenon.