An enormous public square and parade ground built to celebrate Ghana's independence.

Where thousands of slaves passed through the "Door of No Return."

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

This underground museum highlights the history of Mexico City's subway system.

This architectural wonder of Mexico City houses several art schools and national research centers.

The underground mall's skylights look like they could be part of a spaceship.

Diego Rivera's massive tiled fountain and failed infrastructure project.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

The highest point in Texas is capped by a big silver pyramid.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A monument at the site of the Towner School Bus Tragedy, which lead to changes in school bus safety.

This memorial pays homage to Pueblo's four Medal of Honor recipients.

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

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

When ecosystems collide in the arid Southwest.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

Adobe ruins punctuate the beauty of an 800 foot canyon carved by the Canadian River.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.