There has been a tavern that has appeared in several cities, on different continents of my home-brew campaign world in dnd. It's known as the Trumpeting Swan, or The Swan, and every tavern looks identical no matter where it's located. In the nearly 25 years that it's been in my games, it was this past weekend that my players finally realized that it is indeed the exact same tavern that exists as a pocket dimension created by the God of the Hearth.