1. Strasbourg Cathedral (Notre-Dame de Strasbourg) — Grande Île
A pink sandstone Gothic masterpiece with an astronomical clock and rooftop platform.
Strasbourg's cathedral, built of pink sandstone from the Vosges, has a lacy single spire that made it the tallest building in the world for over two centuries. Inside are superb stained glass and the 19th-century astronomical clock, whose automata parade at 12:30pm.
Climb to the platform for a view over the rooftops of the Grande Île.
Good to know: Buy a ticket for the 12:30pm clock show in advance, and climb the platform afterward.
Place de la Cathédrale, 67000 Strasbourg