The ruins of an ancient city in southern Mexico have yielded evidence of long-lost underground tunnels.
East London's Blackwall Tunnel, which stretches underneath the Thames, remains a hotspot for ghostly tales.
A group of anonymous individuals have been digging tunnels in search of evidence of 'giants' in New Zealand.
Many people were left puzzled recently when DARPA made an urgent request for subterranean tunnels.
The openings, which were found near the Moon's north pole, could lead to an extensive network of tunnels.
Secret tunnels have been discovered beneath the stage of William Shakespeare's Curtain Theater in London.
Subterranean passageways once believed to be an urban legend have actually turned out to be real.
Undearneath the ancient capital lies a complex labyrinth of tunnels and quarries dating back millennia.
Researchers have been using a special robot to explore tunnels below the ancient city of Teotihuacan.
A vast network of neolithic tunnels built 12,000 years ago would have criss-crossed the UK and Europe.
India's Chandrayaan-1 has found tunnels below the surface of the Moon that could one day be a home to humans.
An elaborate network of underground tunnels found in a disused quarry on the Greek island of Crete is now thought to be ...
A hole found on the moon is thought to potentially lead down to a vast underground tunnel system. Carved by lava, tunnel...
British explorer Andrew Collins has claimed to have discovered an extensive series of chambers and tunnels underneath th...
A new worldwide study is documenting thousands of cases of near death experiences, revealing the frequency of cases in w...
A vast underground canal system built by the ancient Romans has been found that runs through over 100 kilometers of ston...