1) Glenwood Hot Springs Lodge, Colorado, USA
Full of history and natural beauty, this particular swimming pool is so much more than a regular pool, in fact it has plentiful reputed health benefits too. Opened way back in 1888, the lodge is actually a natural hot spring, which we know is great for alternative medicine, and anyone with skin issues, rheumatism, or arthritis. The pools actually contains around 15 different minerals and are set naturally at 90 degrees – if you want to cool down, simply head to the two cold water pools. The lodge was built around these springs, and they re-fill naturally daily with around 3.5 million gallons of wonderfully warm waters. This is the largest hot spring pool on the planet and has two water slides which the kids will love.