“Live under a rock” as an idiom means “being ignorant to what happens in the outside world”. If you’ve ever been accused of “living under a rock,” you’ll feel right at home in Setenil de Las Bodegas in Spain. Many of this tiny town’s 3,000 residents live and work beneath a huge rock, where homes are built right into the rock. It provides so much shelter that historians think this area has been occupied by human settlements since the Stone Age.