Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

The oldest military monument in the United States.

The world's largest fully steerable radio telescope.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This former fire tower found new life as a communications hub complete with a scenic overlook.

Recorded as the first person buried in Arlington Cemetery.

This gravelly, dangerous highway is the only road in the United States that leads to the Arctic Ocean.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

One of the first Second Empire-style buildings constructed in North America.

This general store has stood in the same spot for well over a century.

The oldest arched-covered bridge in Virginia has truly withstood the test of time.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

Dating to 1793, this is the oldest building in Poolesville.

This university transit system is a 1970's vision of the future.