There is a plot in the Baker Lake area of Canada which has been blackened out by the Google maps. Many theorists feel that it is hiding extraterrestrials which the government doesn’t want anyone to see.
10. Szazhalombatta Oil Refinery, Hungary
The reason is highly unknown why this oil refinery in Hungary was marked as green with all its surrounding areas completely deleted including buildings and its surroundings. It is a rumor that the green patch hides a green field but maybe there is something worth hiding beneath that grass.