Nördlinger Ries
Nördlingen lies in the center of a huge, basinlike depression, the Ries, that until the beginning of this century was believed to be the remains of an extinct volcano. In 1960 it was proven by two Americans that the 24-km-wide (15-mile-wide) crater was caused by an asteroid at least 1 km (½ mile) in diameter. The compressed rock, or Suevit, formed by the explosive impact of the meteorite was used to construct many of the town's buildings, including St. Georg's tower. If you want, you can bike around the crater.
