In the the best-known chapel in the Apostolic Palace, the official residence of the Pope in Vatican City, in Rome, you can admire the Creation of Adam by Michelangelo, on the chapel ceiling.
Saint Sophia Cathedral in Kiev was named after the 6th-century Hagia Sophia cathedral in Constantinople (dedicated to the Holy Wisdom of God). The first foundations were laid in 1037, but the cathedral took two decades to complete.