And then there is Petra in Jordan.
Many people who have a large enough cave, again, if it's dry, will use it for supplemental storage.
Around Bloomington and Bedford where they mine limestone there are numerous abandoned limestone pits cut mostly into the side of hills.
Almost bought an 11,000 sq. ft. concrete and steel house that looked like a medieval castle snuggled into one of those sites. It had a serious rattlesnake problem so it was quite affordable. They lived in the prairie on the roof ~ they ate a lot of bunnies. Otherwise it was a fantastic place.
http://www.trulia.com/property/3049038599-3390-S-Snoddy-Rd-Bloomington-IN-47401#photo-1 It’s for sale again at $1.4 million ~ ten acre lot, 4 acres consisting of a lake ~ see pictures ~ plus there are two smaller ponds on the back of the lot. Do not be fooled by the claim this has only 2 parking spaces! Also, looks like they took my advise and put in a manufactured home ON TOP so there was someplace to retreat in winter. You can imagine the heating costs for this turkey, but at 110 degrees in summer heat it stayed in the 70s ~ while I was there. We have a great video clip about the snake skins hanging from the ceilings.