New scans have unveiled anomalous 'voids' hidden within the walls of the ancient architectural wonder.
Does a Google Earth satellite image of a door in Antarctica really show an entrance to a secret base ?
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 very eerie spectacle was recently captured on camera at the dark and foreboding entrance to someone's attic.
Archaeologists have released footage from inside the corridor which is situated above the pyramid's main entrance.
Nicholas Reeves still believes that the entrance to Nefertiti's tomb lies somewhere within King Tut's burial chamber.
Former Minuteman commander Robert Salas maintains that he reported the incident to the UFO task force last year.
Caves dotted around the surface of the Red Planet could provide a safe haven for future human explorers.
An eagle-eyed Google Earth user has identified what appear to be several underground tunnel entrances.
NASA has released a fascinating photograph showing a large cave entrance on the slopes of a Martian volcano.
A very strange house with no door or other means of access is to go on sale in England for a mere $130.
The openings, which were found near the Moon's north pole, could lead to an extensive network of tunnels.
Norway's Svalbard Global Seed Vault has been breached by water flooding in through the entrance.
Hypnosis has been found to be a viable alternative to anesthesia for patients undergoing brain surgery.
Norway's Svalbard depository enables the storage and research of seeds from all over the world.
Footage showing a strange shadow figure walking across the road at the entrance has appeared online.
The find, which is being hailed as 'extremely important', could be connected to Alexander the Great.
Police in Germany are hunting two hypnotists in connection with a spate of unusual robberies.