A network of underground fortifications, built in the 18th century. The fortifications and environs are recognized as a UNESCO World Heritage Site.
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The Alzette, thought it is very small now, because the sandstone of the area is very soft, it dug out a huge valley. This is called the Ville Basse and is a spectacular area particularly the Grund (Statgrond) which is well worth the time to take a stroll around. The old fortress surrounded this valley. The Venceslas walk (named after Venceslas, Czech king and count of Luxembourg who built much of the fortresses around) leads along the fortresses, protecting the city on one side (and now forming one of the most spectacular "balconies", the Corniche) and the fortress of the Raam plateau on the other.
This church took on its present form in 1688, but was probably built in the early 14th century. It was restored during 2003 and 2004.
Pedestrian promenade along the rim of the Alzette gorge, described as Europe's most beautiful balcony.