Tunnels

One of the world’s few undersea pedestrian tunnels connects Honshu and Kyushu islands.

The longest pedestrian tunnel in the world.

What was once an ordinary pedestrian tunnel under Gorizia Castle has been transformed into an immersive artistic experience.

its a 480 Meter tunnel on a public bridal way which is currently unlit so take a torch even in the day

A tunnel commissioned by ‘the Intruder King’ to escape from the palace if there were problems.

Both an engineering feat and a monument to bad colonial politics.

Engineering ingenuity during the battle of Gibraltar.

A marvel of engineering, this road ascends a Norwegian hill through six spirals inside of it.

A 1926 cow tunnel that passes underneath the nation’s longest road.

Relics designed to contain and conceal Yugoslavian submarines.

This underground tunnel system built during World War I offers a fascinating glimpse into Pula's military history.

This tunnel gave a name to a tiny community, but is now abandoned.

Medieval streets buried beneath a papal fortress now form an underground city you can walk through.

Built in the 18th century, and now the largest roost for hibernating bats in Britain.

Prehistoric humans once used this sprawling lava tube network in the Saudi Arabian desert as shelter.

An underground passage originally constructed as an air-raid shelter during the Spanish Civil War.

Europe's longest Hornbeam tunnel.

This is the second-oldest rail tunnel in the United States that is still in use today.