Central Synagogue of Sofia

The Sofia Synagogue (Sofiyska sinagoga) is a Romaniote Orthodox Jewish congregation and synagogue, located in Sofia, Bulgaria. Completed in 1909, the synagogue is the largest synagogue in Southeastern Europe, the third-largest in Europe, and one of two active synagogues remaining in Bulgaria. Despite the building's size, the services are normally only attended by some 50 to 60 worshippers due to the aliyah of most of Bulgaria's Jews to Israel and the secularity of the local Jewish population.

Synagogue data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).