Niagara Falls, USA/Canada

Niagara Falls is the world's most visited waterfall, attracting 30 million visitors annually across three sections: the American Falls (21–34 m high, 260 m wide), Bridal Veil Falls, and the Canadian Horseshoe Falls (57 m high, 790 m wide) which carries 90% of the total flow. Its average flow of 2,400 m³ per second trails only Victoria Falls among this list, yet its proximity to major cities makes it the most accessible thunderous wonder. The Canadian side in Ontario provides the best panoramic view, while the Hornblower and Maid of the Mist boats approach within 10 m of the Horseshoe base. Night illumination from April to October adds a spectacle that no other falls on this list replicate, with 1,200 LED lights creating a 360‑degree rainbow effect.