The Zwerenturm Museum is originally a medieval gate tower built in the Gothic style from 1330 AD, but now it has been turned into a museum and exhibition space. The fortification tower served as a city gate at the end of the stone path of traffic in the direction of Frankfurt, and in 1709 AD, an observatory with the latest astronomical instruments was built to observe the sky in a rotating dome on the top floor of the tower. Today, the museum houses astronomy and space observation equipment, and many paintings, statues and sculptures with a long history.