Hello, Moien,The Pfaffenthal-Siechenhof North Loop route takes you mainly "extra-muros" of the Vauban fortifications (built around 1685), where you'll be able to admire some interesting remains, including Vauban's twin towers, the so-called "Béinchen" bridge, the City of Luxembourg's first water pump, the Chapel and Bons Malades cemeteries, the Eydt mill, the Grand-Duchesse Charlotte bridge (called Pont Rouge in the vernacular), and the Aquatunnel (only the exterior may be seen).The circuit is flat and around 900 metres long.It starts at the bottom of the Pfaffenthal panoramic elevator.Enjoy the walk.The southern part of the district may be found under IZI as the southbound itinerary.