This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

So many migrating birds roost on the bridge, it has a special summer speed limit.

The mounds at this site were reconstructed with the help of archaeologists and historians.

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

The only presidential monument to display a late POTUS's actual casket.

Take a drunken tour inside the world's largest known geode.

The first patented shaved-ice machine heralded a snowy wonderland of iced treats at a favorite New Orleans summer shack.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

The timepiece that exonerated a labor radical accused of a parade bombing that killed ten people.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

The ruins of a once massive plantation are now a private residence hidden in the Florida wilderness.

Where NASA's satellites and rovers phone home.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The largest piece of cut lead crystal adorned a grave for 75 years and is now the shining star of a glass museum.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Washington's iconic carousel has a nice piece of Civil Rights history.