City of Brass
The City of Brass is a location in the Dungeons & Dragons multiverse; this enormous city is found on The Plane of Fire in the Great Wheel or the Elemental Chaos in the World Axis. It is the foundation of the empire of the efreeti, a race of fire-aligned genies, and is the center of their power in the multiverse. This is often a place where adventurers will go to find magic items, as for some reason they have a ton of them.
Unusually for a planar location, which Wizards normally guarded with jealous attention, the City of Brass also exists in Pathfinder, and also on its Plane of Fire. This is likely due to name originating in One Thousand and One Nights, rendering it impossible for Wizards to acquire a broad trademark on, and a stray reference in the text for Unearthed Arcana, which was released under the Open Game License, mentioning a visit to "the City of Brass where they must bargain with an efreeti lord". Likewise, it's a hub for interplanar trade.