My favorite memory is following a map to a small isolated hot spring off of some random gravel road in the middle of nowhere. It consisted of a hot-tub-sized pool and a shower.

Whoever was there before had left the shower running. We were the only people there, and hadn't seen anyone pass us on the (dead end) road, so it must have been on for quite a while.

Only when I went to for my pre-soak shower did I realize that it didn't actually have any kind of user-accessible way to turn it off.