'bug is on the trail!
i guess i could hold out for a more detailed answer, but the appalachian trail will do.
the top picture is an alpine shelter, or lean-to that i spent many winter nights on solo backpacking trips. the side you can't see is open to the elements, but there are 2 small fireplaces for the really cold nights. if the world ever goes to heck in a hadbasket, that's where you'll find me. i've even rebuilt parts of it after some rotten people chopped and burned sections.
the second is a feature on the trail called the lemon squeezer. it is a fracture in a huge rockface that the appalachian trail goes right thru. it's difficult to maneuver with a day pack on your back, let alone a thru hikers pack. but if you don't go thru, you haven't completed the trail.
ok 'bug, you're up.
in nomine patri, et fili, et spiritus sancti.
Meh nom eh noh...doot dooooo do do do.