Stonehenge, Wiltshire

Crop formations (well, they’re not always circles) are no modern hoax, but whether they are indeed hokum is highly contested by some. The intricate patterns that seemingly pop up overnight are swirled across paddocks as close as Tully in Far North Queensland, but the UK is the monarch of mysterious markings.
The United Kingdom was the site of the first reported crop circle back in 1678 and continues to be branded by the phenomena today.

The prehistoric monument – a ring of massive stones dating back to around 3100 BC – is World Heritage-listed for its cultural significance, though scientists are still baffled as to its original purpose.
Advocates of the ‘ancient alien theory’ suppose the site served as a landing pad for spaceships, or an identifier for extraterrestrial beings to spot us from the sky.