A wonderful region if you are into caves and cave dwellers is the Dordogne region in France. It has the Lascaux cave, but also dozens of others. And in some places are the remnants of fortifications that were built making use of natural caves in cliff faces. Some of these were inhabited starting in the stone age and continuing into the first half of the 20th century. A number have been turned into museums and restored into the state as it was a hundred, two hundred or five hundred years ago. Really fascinating stuff.
There's a town in the State of South Australia called Coober Pedy.
It's in the middle of nowhere, desert setting, and a lot of people live in underground dwellings to have a home that has a cooler environment than the blazing heat outside.
Being a mining town (opals), I guess it was just as easy for the miners to dig out their home, as dig their mine shafts and tunnels.
From what people have told me, quite a number of people who want to be left alone like hermits, find themselves in this town and as a result of this, and the desert surroundings, there's some real strange atmosphere to the place. I also believe it has some landscape just out of town that looks a lot like the moon's surface, it's that desolate.
It's like the one time I thought I liked cats. I met a girl who had one and hooked up, unbeknownst to me I was allergic. After petting the cat for a half hour, we got down to business and as I moved in for a kiss I sneezed in her face. Date over.