The Greek Isles are:

Some photos of the caves in Cappadocia:

The main thing to see in Cappadocia is the fairy chimneys.  Basically, they are geographical oddities caused by layers of ash from ancient volcanoes covering the land, solidifying and then eroding over time.  The result is varying types of conical shaped rock formations.  In addition, some of these formations were carved out by and inhabited by ancient peoples (we’re talking 3,000 BC here) up until 40 years ago, when the government moved them out for safety reasons.  So basically people were living in caves.  For like, a really long time.  Here are some of the chimneys:

Since this is (theoretically) a PG-13 blog, I'm not even going to talk about what I really think some of these chimneys look like.  Nope, gonna stay right. out. of. the. gutter.