The Prague astronomical clock, also known as Pražský orloj, is a medieval timepiece located on the Old Town Hall in Prague, Czech Republic. Dating back to 1410, it's one of the oldest clocks still ticking today. This cool clock not only tells time but also shows the positions of the Sun and Moon, has statues of saints, and puts on a show with moving figures every hour. Plus, there's a legend that says bad things will happen if the clock isn't taken care of – spooky!