Built in 1386, the Musegg Wall is part of the city ramparts and is still almost entirely intact. You can visit four of its nine towers (Schirmer, Zyt, Wacht and Männli), one of which (Zyt) contains the oldest city clock. Built by Hans Luter in 1535, it’s given the honor of being allowed to chime the hours one minute before all the other city clocks.