Bergheim is a commune in the Haut-Rhin department in Alsace in north-eastern France. It is a completely fortified town and has magnificent towers and walls. The entire population was wiped out by two wars and the plague in the 17th-18th centuries. To replace the population, thousands of people from other countries were invited to immigrate to Bergheim. The majority of people who immigrated at that times were Swiss, German, Hungarian, Austrian, or Romanian.
Pictures here are of the first tour. The second and third are further down the page.