Four buildings I've found so far. The Main Cabin (duh), a generator shack nearby,
a fire watch tower near the corner of map, and a radio station on another corner.
Radio Station has a button, but no idea what it does. Firetower is really messed up, like a tornado hit it or something.

Oh. And there is a crashed plane opposite the Firetower and radio station.

Other minor things include: Two benches with a Lamp/bugzapper, a fallen tree, bridges, and the campfire.

Considering the firetower, crashed plane, and fallen tree, I'm guessing a severe weather event happened.

I found 4 photos on a fire tower and one on a radio tower

fire tower:
1) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229278/8FF017898088B65026AD51992F7D6A90E853B6B4/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
2) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229850/31716B47CD0D0913F13E0FF84D1C981E680889B8/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
3) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229633/A63EFC9F03DD99F2813BF211FD040FCA8C15CF8B/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
4) https://steamuserimages-a.akamaihd.net/ugc/2453989425934228947/BAD7EF09E04B79C66D6F4544E9263D46BAC24F2C/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

radio towe:
https://steamuserimages-a.akamaihd.net/ugc/2453989425934229466/3480BD6D42567FBE27592610D4661910F73E6841/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

引用自 Kestrel17：

I found 4 photos on a fire tower and one on a radio tower

fire tower:
1) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229278/8FF017898088B65026AD51992F7D6A90E853B6B4/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
2) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229850/31716B47CD0D0913F13E0FF84D1C981E680889B8/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
3) https://steamuserimages-a.akamaihd.net/ugc/2453989425934229633/A63EFC9F03DD99F2813BF211FD040FCA8C15CF8B/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false
4) https://steamuserimages-a.akamaihd.net/ugc/2453989425934228947/BAD7EF09E04B79C66D6F4544E9263D46BAC24F2C/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

radio towe:
https://steamuserimages-a.akamaihd.net/ugc/2453989425934229466/3480BD6D42567FBE27592610D4661910F73E6841/?imw=5000&imh=5000&ima=fit&impolicy=Letterbox&imcolor=%23000000&letterbox=false

I'm guessing an alien encounter of sorts.

theres a button in radiotower Idk what it does but its abseloutly does something.

引用自 Maqsud101：

theres a button in radiotower Idk what it does but its abseloutly does something.

Yeah ive seen this too and I would love to know what it does.