St. Alexander Nevsky Cathedral is a prominent Orthodox cathedral located in Sofia, the capital of Bulgaria. Built between 1904 and 1912, it was designed in the Neo-Byzantine architectural style and is one of the largest Eastern Orthodox cathedrals in the world. The cathedral honors Alexander Nevsky, a Russian prince and military leader known for his defense against invaders. The cathedral features a stunning golden dome and intricate mosaics, making it a significant landmark in Sofia. It serves as a mausoleum for Bulgarian soldiers who died in the Russo-Turkish War and is a popular site for both worship and tourism.