Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

Legends surround this jagged rock formation in the New Mexico desert.

The eccentric mansion of one the most popular horror authors of modern times.

Moonbows over Kentucky.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Two thousand artifacts from around the world collected by one woman who loved to travel.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A beautiful geyser under environmental threat.

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

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

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

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

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

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.