Tunnels

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This psychedelic tourist trap is a leisurely descent into madness.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

This former sugarcane transport tunnel is now a portal to a lovely beach.

This small road tunnel is the only place where you can cross beneath the Erie Canal.