The first photo looks evil, doesn't it? There are a LOT of letters and shapes at this site. Since the number "3" is the number of completion, according to The Book of Jubilees; I wonder if that number "6" stands for 2 different caches or vaults have been completed.
The third photo looks, overall, like a 3-toed foot print. There are also a LOT of letters and numbers on this site. I've tagged many of them as well as outlining the footprint in red. That damned tag box at the "big toe" opening shifted and partially covered the area. I'm not going to delete the whole thing just to redo the pic. Sorry......
The 5th photo has a square shaped hole (a vault) and an incised line beside the square that could be a compass heading??
The 6th photo has a possible monument stone up on top and what looks like a half-buried heart at the base of this wall.
I don't know if the signs shown in all of these pictures are related to each other.
The 4th picture (i believe) is related to a tomb or vault,
If you do find this I would exercise much caution if you do intend to enter.
The numbers and signs shown in your pictures are not related to anything I am familiar with.
I am sure they don't carry the same meanings as those we see regularly.
please use restraint when opening up new or fresh sites,
there are inherent dangers that accompany the unknown.