A headstone tells the sad story of a lost little boy and his pet dog.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

This stuffed pigeon of war had the very serious name "John Silver" until he lost a leg in battle.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

A real flying saucer, contracted by the U.S. Air Force.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

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

The fifth-longest natural arch in the world, and the longest outside China.

This sculpture may be the only known depiction of a man who helped finance the American Revolution and inadvertently created the dollar sign.

The world-record holder for the longest bridge stretching continuously over water.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.