Tunnels

In a pedestrian tunnel on North Carolina State’s campus resides an expressive and artistic free-for-all.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

This tunnel was built in order to protect the village of Daroca from flash floods during rainy seasons.

This urban stream flowing underneath Tasmania's capital city is also an unofficial gallery for street artists.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

Home to the longest wooden escalators in the world.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

The tunnel that runs beneath this former inn was once a hiding place for enslaved people seeking freedom.