Chapel of Saint Petka in Belgrade - Credit: Wikimedia Commons
The Chapel of Saint Petka (Serbian: Капела Свете Петке) in Belgrade is a chapel, erected over a sacred spring, and dedicated to Saint Petka. It is located at a way connecting the upper and the lower city of the Belgrade Fortress, in proximity of the Ružica Church, with the spring being in the very altar of the chapel. The present-day chapel was built in 1937 after a project of the architect Momir Korunović. Its inner walls and vaults are covered by mosaics done by painter Đuro Radulović in 1980–1983. Read more on Wikipedia
Source: en.wikipedia.org