Museum near Gießen, 1 of 6
Museum near Gießen, 1 of 6: Mathematikum

A hands-on math museum where every exhibit is meant to be touched, built or puzzled over. Kids test shapes, balance and numbers with their hands instead of a worksheet. Experiments are labeled in German and English. A separate Mini-Mathematikum area is set up for younger children, and most families stay two to three hours.