Part of the artwork Tiger & Turtle. Tiger and Turtle - Magic Mountain is an art installation and monument in Angerpark [de], Duisburg, Germany, built in 2011. 1] [2] It is 21 meters long, made of galvanized steel and costs two million euros to build . 3] It was designed by Ulrich Genth and Heike Mutter. It looks like a roller coaster, but it's a footbridge with stairs. The vertical loop continues along the walkway and stairs, but it is not walkable and is blocked. In 2013, Tiger and Turtle - Magic Mountain was ranked #6 on HuffPost's list of most extreme kicks.