The 114.5m (376-ft.)-tall vertical scribble, a publicity exercise by a steel concern that is now failing, has observation decks at 76m (249 ft.) and 80m (262 ft.), but it barely matters when there’s not much to look at. It originally overlooked the Olympics but the torch and the games are gone, but now it peers into a stadium many miles from town. So tragic have attendance numbers been than in 2016 it added a 45-second tunnel slide, the world’s longest and tallest and ridden on a mat, to turn the journey down into a thrill ride that wraps around the structure 12 times. At the press conference unveiling the desperate measure as a “major new art installation”, the architect, Anish Kapoor, complained to the media that the mayor “foisted” the slide on his sculpture. Wear a jacket because it gets windy in the exposed areas. And no, it doesn’t orbit. Note: Slide restricted to people taller than 4 feet 2 inches/1.3m