A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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

A downtown park built on top of unclaimed graves.

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

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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

Breathtaking and huge 430 year old maps of Italy.

The Pope’s secret escape route.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A building so large that it has its own weather.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

A monument celebrating the idea of reaching inaccessible places.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.

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

This mountain's identity is stuck somewhere between a nightmare and a scenic tourist attraction.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.