There are 2,000 of these ancient tunnels throughout Central Europe, especially in Bavaria. No one is sure who made them or ...

In this video, we break down the technology and design of traffic tunnels, looking at everything from the Boring Company’s ...

Mysterious micro-burrows in desert marble and limestone were probably made by microbes that lived millions of years ago. Exactly what kind of microbes bored into the rock remains unknown, as does ...

Norway is building what is to become the longest and deepest road tunnel under the sea. The Rogfast project, measuring 26.7 kilometers (about 16.5 miles) and descending to 392 meters (nearly 1,300 ...

Probably Europe's largest deposit of rare earth metals, Kiruna's Per Geijer, is moving forward. The project is so massive ...

A nearly 20-mile underground relic of Nazi tunnels, shafts, underground railway stations and combat facilities in Poland can now be toured after being transformed into an army museum. The subterranean ...