This small picturesque place lies a couple of kilometers outside of Arlen (capital of the Belgian province Luxemburg). En route for the Luxemburgian village of Eischen, you pass by a little chapel, dating back to the 19th century. It is worth pulling over the car to visit this little chapel, because that's only a small part of what you get to see. Next to the chapel is a staircase, leading down to an archaeological excavation of a medieval monastery.
The monastery was founded in about the 13th century by Countess Ermesinde, and was burned down during the French Revolution in the 18th Century.
There are, hower, indications for earlier occupation of this place, such as graves dating to the 10th century AD. Even than, it probably had a religious meaning, and the monastery may be a replacement of an even older structure.
When you get down to the archaeological site, you will see there's a small fountain. This fountain is still delivering water from the same source as more than 700 years ago. It is said that Saint Bernard visited this site, hence the source is said to be holy.