Boarding Alien Swirling Saucers has become a little more orderly with the introduction of assigned rocket numbers.

Originally built as early as 4000 years ago, this structure is just one of a larger network in the Salisbury Plain that ancient astronaut theorists believe are more than just ritual sites in this clip ...

Explore 25 Earth locations that look like another planet! Discover bizarre landscapes, from Martian deserts to icy moons, ...