A gyalogos hullámvasút, a 21 méter magas, kanyargó lépcsősor Duisburgban

Visitors walk on the large sculpture 'Tiger and Turtle' on a cloudy summer day in Duisburg, on July 13, 2023. Tiger and Turtle - Magic Mountain is a large sculpture modelled on a roller coaster and is a work of art by Heike Mutter and Ulrich Genth that was developed as part of the Ruhr.2010 Capital of Culture. (Photo by Ina FASSBENDER / AFP)