Huge ancient underground tunnels have been discovered in Brazil and Argentina, and the source of these huge structures is not believed to be due to humans or natural geological processes. Reaching ...

An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to exist. Ground-penetrating radar and laser scanning revealed that the ...

JERUSALEM — Under threat from Romans ransacking Jerusalem 2,000 years ago, many of the city's Jewish residents crowded into an underground drainage channel to hide and later flee the chaos unnoticed ...

History buffs and lovers of unique experiences have the chance to walk through the same underground path once secretly used by emperors beneath Rome’s iconic Colosseum. The Commodus Passage is named ...

A top travel destination has uncovered an ancient secret. A little-known network of subterranean passageways hidden beneath Rome’s Capitoline Hill — holding clues to a long-ago chapter of the Eternal ...

During renovation of a street in Split, Croatia, archaeologists revealed an ancient Roman tunnel leading to cellars of Diocletian’s Palace. Photo from Vesna Bulić Baketić As workers dug up a street in ...

Quiet remains of far earlier worlds can be found on cliffs in some of southern Africa's harshest regions. Signs of changing climates and gradual geological stress are frequently preserved in marble ...