Because of its rich silver mines, Kutna Hora was Bohemia´s second largest city in the Late Middle Ages and in the Renaissance period. Today it has lost much of its importance, but it´s still one of the Czech Republic´s star attractions. The old town of Kutna Hora is well preserved and offers a great view of the surrounding area, since it´s located on a hill. The church of St. Barbara, the Italian Court and the Czech Silver Museum are definitely worth a visit (although I didn´t get to go on a tour of the mines, either). The suburb of Sedlec offers two more attractions - the Cathedral of Our Lady (newly renovated) and the weird Ossuary, which isn´t, as far as I can see, a part of the World Heritage site, but should be. Kutna Hora is an easy daytrip from Prague, but can also be reached from Brno. It´s definitely one of the best sights in the Czech Republic.