While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

The only recreation of William Shakespeare's indoor playhouse.

Outsider art meets paleontology at this roadside reptile repository.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

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

A haunting tribute to pioneering photographer Clover Adams.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

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

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A carved bench marks the Scottish cave that inspired the classic adventure novel "Treasure Island."

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

Final resting place of one of the classic authors of horror literature.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

You can spend the night in Dr. Frank-N-Furter's castle.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.