Where Saint-Martin ends and Sint Maarten begins (or vice versa).

One of the oldest, tallest, and most haunted lighthouses in America.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

A stretch of highway even lonelier than the so-called "Loneliest Road in America."

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

One of the best-preserved Native American mounds remaining in the southern United States.

An idyllic mineral hot springs facility with a more-than checkered past.

A beautiful example of 18th-century engineering still standing tall.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

The quirky gift from West Berlin for the 1968 World's Fair still stands in Hemisfair Park.

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

This building contains handprints that are well over a century old.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A historic dam made famous for its turbines and feature in a Hollywood classic.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Two Civil War-era cemeteries stuck between runways at the world's busiest airport.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

This ever-changing arrangement of naked dolls even caught the attention of "The Walking Dead" crew.

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

FDR hoped to find a cure for polio in this Georgia town's warm springs.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.