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The Backrooms

If you're not careful and you noclip out of reality in the wrong areas, you'll end up in the Backrooms, where it's nothing but the stink of old moist carpet, the madness of mono-yellow, the endless background noise of fluorescent lights at maximum hum-buzz, and approximately six hundred million square miles of randomly segmented empty rooms to be trapped in. God save you if you hear something wandering around nearby, because it sure as hell has heard you.

Lost? Disoriented? That's the point.

When subscribed, you can find the map at the following directory;
Steam\steamapps\workshop\content\440\1771712394
In order to have the map be playable, move the map file to this directory;
Steam\steamapps\common\Team Fortress 2\tf\download\maps

Original map created for Gmod by yapyeerdolee. Edited and ported to TF2 with permission. Check them out. https://gamebanana.com/members/1406073