Water parks are fun for a few reasons. If the weather is nice and you're with friends, they can be a great time. Alas, weather and location are two serious limitations of fun when dealing with water-based activities. Fear not! We humans are quite resourceful and will never let things we cannot manipulate be un-manipulated for long.

Thus, intrepid engineers and visionaries-of-fun have given us the indoor water park, where the temp. never dips below 80, where there's plenty of soaked concrete and metal. The humid, stuffy atmosphere resounds with the sweet sounds of shrieking children reverberating off the steel-reinforced ceiling.

Here are the 15 craziest indoor water parks in the world.

By Marc Yearsley