The headquarters of the famous Yale society.

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

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

A historic presidential getaway on the continental United States' southernmost island.

A monument celebrating the idea of reaching inaccessible places.

Honoring combatants from Portsmouth who served in Cuba and the Philippines during the Spanish-American War.

A lightship turned museum, outfitted with artifacts from the vessel's past as part of the U.S. Lighthouse Service.

Dedicated to a veritable Houdini among P.O.W.s who escaped imprisonment on five separate occasions.

Located on the campus of Emory University, this museum is filled with objects from the Americas to ancient Greece.

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

This slender three-story building has also had several famous residents.

New York City's smallest piece of private property.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

Journey inside the bowels of this sperm whale sculpture.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

This park is home to a massive bird sanctuary. And maybe buried treasure!

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.