The Raschpëtzer Qanat is located NE of Helmsange in the commune of Walferdange, 10 km north of the City of Luxembourg.
A qanat is an underground water management system consisting of vertical shafts connecting to a sloping tunnel designed to provide a supply of fresh water.
The Raschpëtzer is a particularly well preserved example of a qanat and is probably the most extensive system of its kind north of the Alps.
To date some 330 m of the total tunnel length of 600 m have been explored.
[1] The qanat appears to have provided water for a large Roman villa on the slopes of the Alzette valley.