Best rock/concrete

[Tennessee Viking]

I figured this thread actually belonged in the humor section, but was wondering what people's favorite Forest Service shelter are. Those cramped concrete/rock structures that sometimes you just have to deal with.

[dmax]

Mcqueen's knob "shelter" - the holiday inn!

[dmax]

Oops. I just read this and it's neither rock or concrete. Sorry

[Wise Old Owl]

The cave at the Pinnicle in PA