An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The "lovely red Vega" of the legendary record-settling pilot.

Perhaps the most scandalous statue of America's first president.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Decades before the scandal, this staircase on the river was a literal "water gate."

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

A celebrity from the late Cretaceous period.

At 207 feet, one of the world's longest continuous escalators.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

A piece of the iconic wall found an unlikely new home in a Vegas bathroom.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A super-sized promotional trick that is now a D.C. landmark.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

Experience a charming 1930's version of "infotainment."

The house where John Wilkes Booth conspired with his co-conspirators.

Step inside Lucy, the world's largest "elephant."

The oldest continuously operating fish market in the United States.

Elvis's own personal tropical hideaway.

What remains of the summer palace of King Kamehameha III.