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

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The preserved house of a jazz legend still echoes with his music.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The enigmatic and seldom visited ruins of a Mayan city-state.

The hot chocolate here all stems from small, sustainable microproducers in Chiapas and Tabasco.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

A barbarous band of serpents guard the bases of these Aztec temples.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

This beautifully deceptive waterfall is something far different from what it appears to be.

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

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

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

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

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

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

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