The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

The only castle in North America to ever house European sovereigns.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

The winter home of millions of migrating monarch butterflies.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A taste of Middle Earth, in the middle of the Bayou City.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

A Prada store in the West Texas desert that is never open for business.

One part antique store, one part curiosities hodge-podge.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

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

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

The oldest continuously occupied public building in the United States.

A little slice of Florida face-in-a-hole kitsch, unexpectedly located in a small New Mexico town.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

A blacklight journey through a celestial art exhibit.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

A sprawling collection of over 106,000 toys from around the world.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.