Category: tunnel

For years, scientists didn’t know what caused mysterious cave networks in South America. In 2010, they learned that the caves were actually tunnels dug by ancient giant sloths.

The Longest Tunnel in the World is 57 km long and goes from Switzerland to Italy underneath Alps. It took 17 Years to Build.

Photo : Niedax

Over 2000, large man-made tunnels, known as “Erdstall”, have been discovered across Europe, and nobody knows who made them or why.

Image: Pfeifferfranz/Wikipedia

There are 30 kilometres of tunnel underneath downtown Toronto, connecting shops, subway stations and restaurants so people do not need to go outside into the heat and snow.