Christmas Spirit in Prague—World’s Coolest Clock?: Has to be one of them! The Prague Astronomical Clock (Prague Orloj) dates back to 1410 and is the oldest working astronomical clock in the world. Catch it at the top of the hour and it’s amazing. Look closely and you’ll see “The Walk of the Apostles” at the top. A skeleton, representing death strikes the time. An astronomical dial, a calendar dial—it’s a stunning work of art located in Old Town Square on the side of the Old Town Hall. Captured t