St. Mark's Church is a Serbian Orthodox church located in the center of Belgrade, the capital of Serbia. The church was built in the 19th century and is known for its beautiful architecture and colorful roof. The church was designed in the Serbian-Byzantine style by architect Aleksandar Bugarski and completed in 1940.

The most striking feature of St. Mark's Church is its multi-colored roof, which is made of glazed tiles and features the coats of arms of various regions and cities in Serbia. The interior of the church is also adorned with beautiful frescoes and icons, some of which were created by the famous Serbian painter Paja Jovanović.

The church is dedicated to St. Mark, one of the twelve apostles of Jesus Christ, and is the seat of the Serbian Orthodox Church in Belgrade. It is also an important cultural and historical monument, and is often visited by tourists who come to admire its unique architecture and beautiful artwork.

St. Mark's Church has played an important role in Serbian history, particularly during World War II when it was used as a hiding place for Serbian resistance fighters. Today, the church continues to be a symbol of Serbian culture and tradition, and is a popular destination for both locals and tourists alike.