the "mainparksee", a now 240 000 m² lake which came out of building work on the new autobahn in the 1950s from a so-called "baggersee" (a lake arising from an old quarry), offers a long-term camping ground and bathing. since 2005, one of germany’s biggest sauna areas has been located on the lands at the mainparksee. it has been open to the public as a recreation area.