A fictional structure or built object is one with no referent in reality, but which is derived from a work of fiction that describes it in sufficient detail to list it. The source may be a fictional book, a graphic novel, a comic book, a movie, a television show, a cartoon, a video, or another fictional medium. Such objects do not necessarily need to be placed on a map or in a particular geographic location.

The object belongs to a work of fiction and has no real-world referent. The fictional source supplies the detail of its form rather than documentation of an actual structure.

A vision is a mature conceptual design intended for a specific location. A fictional object instead derives from its fictional medium and need not have a geographic placement.