One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This groundbreaking 16th-century map is known as "America's birth certificate."

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

The National Park Service’s best-kept secret with views that rival any in D.C.

American involvement in World War I officially ended in 1921 in New Jersey, three years late and thousands of miles from the battlefield.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

An astounding collection of medical specimens, including bits of President Lincoln.

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

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

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

This Indiana walk of fame honors music legends with record-shaped plaques in the pavement.

The first KFC is on the National Register of Historic Places.

Comprised of Spanish war cannons, this sculpture once graced the bow of a WWI warship.

The hippo that stands on this university campus was once a drunken flea market purchase.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

These five Art Deco homes were meant to solve the "small house problem."

An abandoned church gets a second life as a massive beer hall and event space.

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

Ancient human remains unearthed around the iconic monument.

Famously misunderstood wonder of the ancient world