This is the lost city of the ancient people- keraims. Or in other words, it was the tribe of Jewish people. The city is situated high in the mountain, in Ukraine and is called Mangup. THere are lots of caves, basillica made out of stones, the city wall around it etc. It's really magnificent place. But it was destroyed by Turkish, who envaded into Mangup.Now it's open for tourists and anybody may go there on feet and even stay there for a week, month or whatever and sleep there in those ancient caves..