Walking, of course, is free. Luxembourg is chock-full of walking paths and trails, especially circular walks. This is THE place to go if you love nature, history, and hiking, and want to find a way to combine all three. Within the city there's the Wenzel Walk, a circular walk that takes approximately 2.5 hours in total to complete. This path takes you past the fortress, the old town, and parts of the town outside the city wall. Beyond Luxembourg City there are numerous scenic hikes, the most popular being the Escapardenne Trails and the Mullerthal Trails.