Did you know there is a secret tunnel under the White House? And that the Soviets tried to build a tunnel to get to the centre of the earth, and that it’s still the deepest tunnel ever dug? Since ancient times, human beings have made tunnels to avoid obstacles or take the shortest route. In caves, mountains, under the sea, underneath great cities… Discover the most fascinating tunnels ever built, from the first passageways of prehistory to the Large Hadron Collider, via the largest subway system in the world and other incredible constructions.