While you’re in the Old Town Square, be sure to turn the corner and get a glimpse of the Astronomical Clock, located on the south side of the Old Town Hall. Although it’s on everyone’s list of free things to do in Prague, don’t expect much other than a crowd of people with camera phones up in the air. Interesting Fact: Did you know that Prague is not the only city in the Czech Republic that has an astronomical clock? Visit the Jewish QuarterClose to the Old Town Square is the Jewish Quarter of Prague. Across the street is the Old Jewish Cemetery which is a 15th century graveyard with moss-covered headstones.