This historic train station has been converted to a locomotive themed hotel.

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

Georgia's highest point was given its strange name thanks to a simple translation error.

Remnant of a largely forgotten struggle over resource scarcity.

This building is a recreation of the gatehouse that separated Los Alamos from the outside world during the era of the Manhattan Project.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

Sweet Willy, at 30 feet tall, is the world's biggest beagle.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Two massive rock outcroppings on the Oregon coastline.

100-year-old shipwreck you can walk up to at low tide.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The Gaslamp District's oldest bar sports a urinal marked with a golden plaque that was allegedly used by Mick Jagger.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.

The oldest standing structure in downtown San Diego.

The world’s oldest active sailing ship.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

Limestone caves with spectacular showcase chambers.

Two small markers remember the Alamo's feline protectors.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Hidden in the New Mexico desert southeast of Roswell, nine small deep lakes formed inside sinkholes.