#1 Aqua Mundo (Bailly-Romainvilliers)
When Center Parcs and Disney collaborate with a renowned architect, you get Aqua Mundo in Bailly-Romainvilliers, one of the largest indoor water parks in Europe, located 20 miles east of Paris and under 4 miles from Disneyland Paris. Enjoy water games, lagoons, a wave pool, and slides in a giant origami-inspired complex. The outdoor areas feature year-round geothermal heating to 86°F (30°C).