Shhh, this is a sacred place!

Shhh, this is a sacred place.....

or at least should be.

Although it's being used as a storage space.

This is an ancient drawing on a rock by unknown author, from unknown age and with unknown meaning. It's marked by the locals from the near Rhodope Mountain village of Smilyan as a historical monument. But I bet no one else has ever heard of it.