Built by the Dukes of Zähringen, the 12th century Thun Castle with its four towers overlooks the town and is its most visible feature. Discover the unmistakeable landmark of Thun. http://www.thunersee.ch/en/activities-excursions-events-lake-thun/culture-tradition-lake-thun/castles-in-the-region-interlaken/thun-castle.html