"The Prague Astronomical Clock, also known as the Orloj, is a medieval marvel located on the southern wall of the Old Town Hall in Prague. Installed in 1410, it is one of the world’s oldest working astronomical clocks. The Orloj features a complex mechanism that displays the positions of the sun, moon, and zodiac signs. Every hour, a procession of the Twelve Apostles and other figures appears, drawing visitors from around the world."