Famously misunderstood wonder of the ancient world

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A Colorado store that specializes in all things spiritual, metaphysical, and witchy.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

Take a dip in the world's largest mineral hot springs pool.

A multiversal transit station located right below a highway interchange.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

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

A downtown park built on top of unclaimed graves.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

One part local history, 99 parts gruesome haunted house.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

The most confusing clock in New York.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.