Sometimes the "other side" claims environmentalists want to take us all back to the days of "living in caves".

I think I could swing living in this cave.

Check out the crazy digs ...

Curtis and Deborah Sleepers built an amazing home -- set in a giant cave -- using only local building materials in Festus, Mo. Their home is super, super efficient and stays a comfy 65 to 70 degrees year round.

The best part about the house is they left many visual reminders of the cave on the inside. They also decorated with antique wooden furniture which lends an organically classy air to the place.

[KPLR11] via [St Louis via Apartment Therapy LA]

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