An art group has come forward to claim responsibility for creating the Utah and California monoliths.
The ongoing mystery of the metallic monoliths appearing around the world is showing no signs of slowing down.
The mystery of the '2001' monoliths has deepened after another one has appeared half way across the world.
A prophet is investigating a series of deaths attributed to a mysterious creature at a bridge in Zimbabwe.
A real-life version of the monolith from '2001: A Space Odyssey' has shown up in the middle of nowhere.
Further evidence of a large creature has been picked up by Cruise Loch Ness director Ronald Mackenzie.
A team of researchers has discovered a mysterious stone formation beneath the Straits of Mackinac.
For the second time, pilots have witnessed a 'jetpack' flying at altitude over Los Angeles International Airport.
Scotland's coastguard has been attempting to solve the mystery of a spy boat found on the remote Isle of Tiree.
Cruise Loch Ness director Ronald Mackenzie captured the sonar image while out on the loch last Wednesday.
A photograph taken during a family day out in 1964 would go on to spawn a decades-long mystery.
Hundreds of elephants have been mysteriously dying in Botswana and scientists have finally figured out why.
An elderly female snake that hasn't been near a male in 15 years has inexplicably laid a clutch of eggs.
Experts are attempting to solve the mystery of an unidentified man who washed up on the Isles of Scilly.
Japan's answer to the legendary cryptid was first sighted during a mountain drive one night 50 years ago.
Packets of unidentified seeds have been turning up, not just in the US, but also in Europe, Canada and the UK.
Authorities in three states are investigating why people have been receiving mystery seed packets from China.
Astronomers have discovered a number of peculiar ring-shaped 'islands' unlike anything ever seen before.
Scientists have revealed what the mysterious gel-like substance found on the lunar surface actually is.
Astronomers have been left scratching their heads after a huge star they were observing mysteriously vanished.