Thun is a medieval city, located on the west end of Lake Thun. Already as early as 2.500 BC a first settlement arose on today's site of the city. The castle - towering above the old town - was built by the Dukes of Zähringen. It has a donjon (PiP 1), dating back between 1180 and 1190. One can enjoy wonderful views over the city (PiP 2) and the mighty mountains of the Bernese Highlands, with the Eiger, Mönch and Jungfrau in the far distance.

Five bridges connect the modern shopping area of Thun with the medieval city center. By far the most interesting is the wooden covered bridge Untere Schleuse (main picture), built in 1724. The flood gates regulate the water flow of the River Aare (PiP3).