Google Maps users have speculated the disk may be a crash-landed UFO - or even a hatch entrance to a subterranean hangar.
A MYSTERIOUS structure in a mountainous region of New Mexico has caught the attention of hawk-eyed Google Maps users.
According to historical Google Maps images, the large disk first appeared in 2003.
Images dating back to 1975 show an empty site where the disk now lies, and a path leading to it from a clearing.
"This is a very remote location, nothing going on up here," he said in the clip, suggesting the object "crash landed" in the area.