The final resting place of the most famous outlaw in the Old West.

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.

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

This is one really big nut.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

Largest Roman Catholic church in North America.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The walls of the iconic dome are hollow and have a secret stairway.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Home to items never before seen by the public.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.