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 ...

Beneath the stone-paved streets of Cusco, a city layered with centuries of Andean and colonial history, researchers have ...

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 ...

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 ...

Beneath the verdant pools of Gan Ha-Shelosha lies a network of medieval tunnels that once powered the thriving sugar industry of the Mamluk Empire. Hewn into soft tufa rock along Nahal ‘Amal, the ...

To find catacombs, go to Rome, home of some of the oldest and longest burial underground tunnels in the world. "Hundreds of ...