Some are understandable, like some military sites, royal residences and say, the whole of North Korea. Others may surprise you. Pretty much all of them are the subject of conspiracy theories.

PACIFIC NORTHWEST, USA

This site is home to the highly controversial operation known as HAARP (High Frequency Active Auroral Research Program) and is located near the Washington-Oregon border.

Rumours HAARP works in conjunction with FEMA (Federal Emergency Management Agency) have led to speculation about hidden agendas.

The conspiracy-minded believe HAARP is a secret weapon for weather modification and have blamed it triggering floods, droughts, major power outages and even earthquakes in Iran.

SZAZHALOMBATTA OIL REFINERY, HUNGARY

This Hungarian oil facility requested to be rendered green, with its buildings and grounds deleted, and nobody understands why.

Even more bizarre is the rumour that the only thing the green block is protecting is a field of grass. Which begs the question: what's underneath the grass?