A Roman-style column in Oregon hides a spiral staircase inside.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Abandoned Air Force base that has fallen into disrepair.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

An abandoned town is hidden in Great Smoky Mountains National Park.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A sculpture of a salmon swimming through a brick building.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

This black shoreline is made up of exploded lava particles.

The highest point in Washington state is a volcano covered in glaciers.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.