During the last glacial period the Rhine changed its course to the one it flows nowadays. Around 14.000 – 17.000 years ago, due to the mix of hard limestone and easily-eroded gravel, the river formed Europe’s largest plain waterfall, located on the Upper Rhine. Behind trees and rocks, the strong and noisy waves of the river glitter in the dim light of the sunset. The waterfall whispers its mystery under a blanket of fog while visitors admire its spectacular view from the viewing platforms, built for tourism on both sides of the Rhine. Tourists have been impressed by the Rhinefall for centuries.