Ten Elaborate Underground Homes

From Neatorama:

This luxurious house called Villa Vals is built directly into a hillside in the village of Vals in the Swiss Alps. A collaboration between architectural firms Christian Müller and SeARCH, it features four bedrooms that are surprisingly flooded with natural light and have beautiful Alpine views. A thermal springs spa is nearby. The exterior is partially made of quartzite collected from the springs and surrounding area. There is a private hot spring in the home, as well as a hot tub and patios. The environmentally-friendly house is thermally insulated and has a heat pump, heat exchanger, radiant floors and uses hydroelectric power generated by a local reservoir.

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