St. Mark's Church (Serbian: Crkva Svetog Marka) is a majestic Orthodox church rising proudly in the heart of Belgrade, on the scenic Tašmajdan plateau near the Serbian Parliament building. It is one of the most significant and recognizable religious structures in the Serbian capital, built in an impressive Serbo-Byzantine style. The monumental building with five domes and a high 60-meter bell tower immediately catches the eye with its grandeur and harmonious forms.

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Architecturally, the church features a complex double-cross floor plan, which is reflected in its grand vaults. The interior includes a spacious narthex with a gallery, a soaring bell tower, and a five-sided altar apse. The church's facades are particularly expressive thanks to the use of three types of stone: light Belovode sandstone from near Kruševac and red Grza stone from Paraćin. The dimensions of the church are truly impressive: it is 65 meters long, 42 meters wide, and the diameter of the main dome reaches 10 meters.
St. Mark's Church is unique for its harmonious blend of ancient Serbo-Byzantine architectural traditions and advanced engineering solutions of its time. Notably, it was the first sacred building in Serbia modeled after Byzantine churches but constructed using a reinforced concrete frame, which was innovative for that period. Additionally, the church was equipped with modern amenities such as central heating and electric bells, making it a truly advanced structure for its era.