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Waterfalls heated by geothermal energy in Tuscany.
If you add maintenance costs, new swimsuits, and a privacy fence to keep your neighbor from seeing your beer belly, you're looking at around $4000 on average. Saturnia residents would likely laugh out loud if they heard that. Their hot tub is state-of-the-art, and they don't pay a dime for it. It's not exactly the latest technology, but it's self-cleaning, self-regulating, and can accommodate many more people than a typical backyard jacuzzi.