Nearly Breaking and Entering
I grew up spending a ton of time in the Colorado Rockies. In college, a friend and I were on a weekend backpacking trip up in the national forest, about three hundred yards off-trail, when we stumbled across a mostly-buried bunker someone had made.
Think a 20-foot-long Tuff Shed, buried up to its roof. We only noticed it because the sun glinted off one of two small windows in the roof, which had been deliberately covered with brush and tree litter.
Looking through the windows, we could make out a cot, buckets and tubs of food, and other supplies. We later found the door that was partially buried, but it had a heavy padlock securing it.
We noped out of there soon after as we didn’t want to run into whoever had built the place.
Story credit: Reddit / Gray_side_Jedi