Fodor's Expert Review Musée d'Histoire de la Ville de Luxembourg
Partially underground, this clever museum traces the development of the city over 1,000 years, working its way up through the centuries as you ascend floors. Its lowest levels show the town's preserved ancient stonework. From a glass-wall elevator, you can also enjoy a wonderful view of the ravine from the upper floors. There's free entry every Thursday from 6 to 8.