Tunnels

A century-old rail tunnel turned eco-friendly cycling path.

A Roman water tunnel still flows 2,000 years on.

Explore these Victorian-era tunnels under a bustling train station.

This lava tube cave was once a Cold War fallout shelter.

On the outside of the Mersey Tunnels, an Art Deco sculpture of an Egyptian Pharaoh wears goggles and racing gear.

Secret tunnels leading to underground facilities lurk near the remains of a World War II-era Japanese Navy airbase.

This unassuming tunnel’s name recalls a storied "cat pond" that has now been lost.

Walk through abandoned anti-Russian military tunnels on this volcano at the head of Auckland Harbor.

An ancient mountain-cut pass runs largely forgotten in the suburbs of Kamakura.

Explore the remnants of a 19th-century tin mining operation and get a glimpse into Tasmania's industrial past.

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

These purpose-built WWII air raid shelters, which run half a kilometer under the town of Mellieħa, are among the longest in Malta.

Over 80 years old, this hand-dug tunnel is a Chinese-style portal to another world.

A Japanese-era military tunnel is now a psychedelic art exhibit.

View Japan's most historic city from a cyberpunk walkway suspended 150 feet above the ground.

These secretive tunnels were once the site of a Royal Air Force fuel reserve depot.