deep hole in the mountain

Holger Grebe, on March 9, said:

perhaps someone may help me here finding the exact position where the photo was taken.

Description: In front you can see a dry stone wall (a guide explained, that it is a part of a roman fort.?) In the background there is a hill with a hole on the highest point of the hill. The hole is very small, so that no one can climb inside (the guide also talked about a treasure there). in the near of this hill is also located a graveyard, where you can find white bones.

Perhaps someone knows this location and may help me with details. Thanks!

zuccospooky, on June 30, said:

I don't know anything about this but it's cool...