Prague Castle and St Vitus Cathedral

The largest ancient castle complex in the world, seat of Bohemian kings and now of the Czech president, on a hill above the Vltava. At its heart, the Gothic St Vitus Cathedral has stained glass by Alfons Mucha and the tomb of St Wenceslas. Also see the Old Royal Palace, St George's Basilica, and the Golden Lane of tiny painted houses, where Kafka once lived.

The grounds are free; a ticket covers the main buildings. Watch the changing of the guard at noon. Walk down through the Malá Strana district to the Charles Bridge.