The Alexander Nevsky Church in Sofia, Bulgaria is one of the largest Eastern Orthodox churches in the world. Construction began in 1882 but wasn't completed until 1912. The cathedral holds up to 10k people. Contributor Mariqllz used a DJI drone to create this amazing aerial view of the cathedral, which is the largest tourist attraction in the country. It was built in memorial to the soliders killed in the Russian-Turkish war of 1877-78, a conflict which freed Bulgaria from Ottoman rule.