During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

A winding, cliffside stretch of road overlooking the Delaware River.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This tunnel looks like a sliver of Shanghai that's stuck in the past.

It was meant to help transport wounded soldiers to a secret underground hospital.

An abandoned town is hidden in Great Smoky Mountains National Park.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.