is slightly higher than its archetype of the Hagia Sophia (56 m). The dome supports a cross weighing four metric tonnes and 12 m height (including its not visible base). Its visible part is 10 m. After the Hagia Sophia, the dome of Saint Sava is the biggest in any Orthodox church. The celebrated dome of the Hagia Sophia, built by Isidore of Miletus and mathematician Anthemius of Tralles, was initially at 33 m which was reconstructed from the mathematical formulas used by its Byzantine architects. Today, after having been rebuilt three times, it has an elliptic form with the diameters 31,24 m and 30,86 m. Among all Christian religious buildings, the pendentive domes of Hagia Sophia (33 m, initially realized diameter), St Paul's Cathedral (30,8 m), Florence Cathedral (43 m), St. Peter's Basilica (42 m), Berlin Cathedral (30,7 m), and Primatial Basilica of the Blessed Virgin Mary (33 m) have larger or approximately the same inner diameters to Saint Sava's. Other than Hagia Sophia, none of them were built on four piers and with four vaults. Among the mentioned domes, Saint Sava's has 24 m-wide vaults, only surpassed by Hagia Sophia's (31 m). The much bigger dome of St. Peter's Basilica has main vaults of only 23 m. If compared to the biggest domes realised in Orthodoxy, Saint Sava surpasses by large the Cathedral of Christ the Saviour in Moscow, whose dome has 29,8 m (outer) and 25 m (inner) diameters, the Kronstadt Naval Cathedral with 29,8 m (outer) and 26,7 m (inner) diameters and the Saint Isaac's Cathedral in Saint Petersburg with 25,8 m (outer) and 21,8 m (inner) diameters. In addition to its big diameter, the dome of Saint Sava has significant interior height as well. With 65 m (from the floor to the ceiling) it is the fourth-tallest dome (by interior height) of Orthodox Christianity, surpassed only by the domes of People's Salvation Cathedral in Bucharest (104 m), Cathedral of Christ the Saviour in Moscow (69.5 m) and Saint Isaac's Cathedral in Saint Petersburg (69 m). The dome of Saint Sava also ranks among the tallest domes in the world. Cross The design of the cross is a blend of the conception of the sculptural ideas of Nebojša Mitrić, who was of Jewish descent and a survivor of the Holocaust, and the architectural ideas of Branko Pešić. The 12 m high, 5 m wide and 4