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.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

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

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This former luxury resort in Kaua'i is now an abandoned relic.

This ancient Hawaiian henge may have been an early star chart.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

This black shoreline is made up of exploded lava particles.

A controversial memorial at the place where Captain Cook met his violent end.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This abandoned amusement park was built on a site with a dark history.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Race through the maze, get your name on the sign.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Watch the newest land on the planet form before your eyes.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.