St Stephen's Cathedral, Vienna

Vienna's Gothic cathedral, the symbol of the city, with a roof of coloured glazed tiles in a zigzag pattern and the eagles of the Habsburgs, and a 136 m south tower. Climb the 343 steps of the south tower, or take the lift up the north tower to see the great Pummerin bell, and tour the catacombs where Habsburg organs are kept.

Entry to the main part of the nave is free. It's in the heart of the old town, a UNESCO World Heritage Site, near the Graben and the Kärntner Straße shopping streets.