The Inn Between

From publisher blurb:

The ranger suggested a drink at the local tavern, which seemed like a good idea after what we'd just been through. The village pub was called the Inn Between - strange - but at least we were able to get a few rooms along with our hot meals. The next morning, the barman was different. So was the decor. And the village. The inn had taken us somewhere else...

This is a system-agnostic dungeon designed to slot easily into whatever kind of campaign you might be running. Use it as a one-time method of moving the players about, a regular method of transportation between adventures, or as a 'world hub' for a larger campaign.