7. St. Ignace Mystery Spot, Michigan, USA

Discovered in the 1950s, the St. Ignace Mystery Spot is famous for confounding visitors with rooms where people appear to shrink or grow, balls roll uphill, and pendulums swing oddly. It remains a staple of American roadside attractions. Science points to clever angles, but that hasn’t dulled the sense of wonder. Details can be found on the official site: