The Magic Mountain Hotel
The Magic Mountain Hotel | Among the offerings of the hotel are hot tubs "made out of huge trunks of trees, dug out, and then filled with hot water perched on a deck overlooking the forest." A mini golf course is built into the forest itself, using the natural world as the obstacles, and there are various outdoor activities such as horseback riding, rafting, and hiking.
Source : http://www.atlasobscura.com/places/the-magic-mount
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