Another aerial photo.

#1 is obviously a large horizontal "cave".  Probably a large rock shelter.  The arrows show a trail coming up from the valley and entering the cave(?) and also show that people have hiked to it from above.  I doubt that this is any more than a HUGE rock shelter.  With enough people to make trails to the bottom AND the top, but I haven't heard of it.....????

#2 is interesting....but I think it's just a shadow.
Shared publicly