The largest church in Serbia and one of the largest Orthodox churches in the world, under construction since 1935 and still not finished. It's locally known as a temple ("Hram") to distinguish it from the smaller St Sava Church ("Tsrkva") adjacent. The current work is to decorate inside the main dome, so nave and south aisle are closed. You enter via the gloomy north aisle, then go downstairs to the main attraction, the crypt (no lift). This is an extensive, bright and polished area with walls covered with modern iconography, so it feels more like a metro interchange for Orthodox saints than a religious building. Services are held regularly here and in the Church, which you can also visit (till 19:00).