Sophia Cathedral

St. Sophia Cathedral - a Christian cathedral in the center of Kiev, a monument of Ukrainian architecture and monumental painting of the XI-XVIII centuries, one of the few surviving buildings of the times of Kievan Rus. One of the most important Christian shrines of Eastern Europe, the historical center of the Kiev Metropolis. In the most authentic manuscript "The Tale of the Past Years," the founding of St. Sophia Cathedral dates back to 1037.
The construction of the cathedral began by Prince Volodymyr the Great, completed by his son Yaroslav the Wise.
Architectural style of the cathedral - Byzantine (original), Ukrainian baroque (modern)
This is the oldest building in Kiev. Now it's a museum.