Live in a cave or a tower: 6 cool homes   Cave house Price: $1.5 million Beds: 3 Baths: 3.5 Square feet: 2,980 Description: You thought caves were dank? This Bisbee, Ariz., house might change your mind. Interior walls are formed by natural rock that is augmented by stone and mortar constructions. Ceilings and walls are rough hewn and robust. Natural nooks were adapted to accept furniture and appliances. And there are lots of nice touches, like the checkerboard tile floors and the big wal ... Full Article...