Belgrade is the capital of the southeast European country of Serbia. Its most significant landmark is the Beogradska Tvrđava, an imposing fortress at the confluence of the Danube and the Sava rivers. The fort is a testament to the city’s strategic importance to the Roman, Byzantine, Ottoman, Serbian and Austrian empires, and it’s now the site of several museums as well as Kalemegdan, a vast park. ― Google

The Church of Saint Sava is a 79 m high Serbian Orthodox church, which sits on the Vračar plateau in Belgrade, Serbia. It was planned as the bishopric seat and main cathedral of the Serbian Orthodox Church. Wikipedia