American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

Dedicated to a colonial woman who was hanged for being a Quaker.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

A stone marker commemorating the first time sound was transmitted over wires.

The ill-fated plan to reroute the Mississippi so that Union ships could bypass Confederate fortifications on the river bend.

A free museum that memorializes the deadliest river flood in American history, and the civil engineering efforts to tame the Mississippi River.

The final resting place of the camel who served with the Confederate Army during the Civil War.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

This humble hole-in-the-wall is home to an incredible pig ear sandwich and serious civil rights history.

This ranch house in Jackson's Elraine neighborhood was home to the civil rights icons and the site of a shocking assassination.

Built by prisoners of war, the largest small-scale model ever built includes eight miles of tiny streams that now sit abandoned.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

Millions of years of erosion created the feature for which this rock formation is aptly named.

On the side of Highway 50 East, between Carson City and Dayton, Nevada, sits a giant metal spider made from a vintage Volkswagen Beetle.

Much of the spectacular canyon followed over a century ago by the Los Angeles & Salt Lake railroad is now accessible to cars.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

This vast and otherworldly landscape is one of the largest dune complexes in North America.

Pleistocene megafauna fossils are the subject of Nevada's newest state park at the northern edge of the Las Vegas metropolitan area.

An inconspicuous footbridge beloved by San Diego locals.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.