Lucerne's well-preserved Medieval city walls date from the 13th century. The historic fortifications are accessible to the public and provide a broad view of Lake Lucerne, the old town, and the Swiss Alps in the distance.
There are nine towers, three of which are open to the public - Schirmer, Zyt and Männli. Take the stairs up one of the open towers to access the short walkway on top of the walls.
And be sure to look at the inner workings of the city's oldest clock, built in 1535 by Hans Luter in the Zyt tower.