3. Verrückt – USA (Closed)
Once the tallest water slide ever built, Verrückt in Kansas City, Missouri, stood an insane 168 feet high — taller than Niagara Falls! Riders shot down in three-person rafts, hit speeds over 70 mph, and even launched over a second hill before landing. Although it’s now permanently closed, its memory lives on as one of the most daring water slides ever made.