Hidden beneath fields, forests, and ancient villages lies one of the Middle Ages’ most puzzling secrets: a vast network of mysterious underground tunnels. Who built them, why they exist, and how they ...

The Moscow Metro is among the largest in the world in terms of network length and number of stations, and it is a global ...

The Park Avenue Tunnel in New York City, also known as the Murray Hill Tunnel, is a historic underground passage originally built in the 1830s to carry the New York and Harlem Railroad. Initially an ...

Japan’s government has uploaded a free Minecraft map, which features the world’s largest underground flooding diversion facility.

An underground tunnel network long rumored thanks to drawings by Leonardo da Vinci under Milan’s Sforza Castle are proven to ...

Millions of people pass under the River Thames each day, by rail, road or foot. We take it for granted. Just two centuries ago, the idea of going under the river would have seemed fanciful. Today, ...

The WebGen 200, a wireless electronic blasting system with enhanced capabilities, security and versatility, meets the “extreme” mining requirements of surface and underground clients.