The Room Behind the Rain
During a hard exterior storm, the crew found a room standing in the rain with four walls, a ceiling and no visible foundation. The inside was dry. A table, a lamp and a set of empty chairs stood exactly as if someone had left minutes earlier.
The crew entered only far enough to place a marker. The lamp turned on when the last person crossed the threshold and turned off when the first person returned.
The room was gone on the next survey. The marker remained, wet on one side and dry on the other.