The Old City of Luxembourg is located at the confluence of the Alzette and Pétrusse Rivers, on a very steep rocky outcrop which is somewhat of a natural fortification that only needed to be completed on the west side. Due to its exceptional strategic position, the City of Luxembourg was one of the largest fortresses of modern Europe which was constantly strengthened and reinforced as it passed successively into the hands of the great European power.
City of Luxembourg as
UNESCO World Heritage Site
