Dangling above the Niagara River, 4.5km north of Horseshoe Falls, the Whirlpool Aero Car was designed by Spanish engineer Leonardo Torres Quevedo and has been operating since 1916 (but don't worry – it's still in good shape). The gondola travels 550m between two outcrops above a deadly whirlpool created by the falls – count the logs and tires spinning in the eddies below. No wheelchair access.