This is what Wikipedia has to say about it:

The Kapellbrücke is a 204 m (670 ft) long bridge crossing the Reuss River in the city of Luzern. It is the oldest wooden bridge in Europe, and one of Switzerland's main tourist attractions.
The covered bridge, constructed in 1333, was designed to help protect the city of Luzern from attacks. Inside the bridge are a series of paintings from the 17th century depicting events from Luzern's history. Much of the bridge, and the majority of these paintings, were destroyed in a 1993 fire, though it was quickly rebuilt.