A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

An early life spent in this "Old Kentucky Home" inspired the writings of North Carolina's most famous novelist.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

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

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

Electrical pylon in the shape of Disney's beloved mouse.

A building so large that it has its own weather.

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 island hill is strewn with boulders carved by shipwreck victims from the age of sail.

Uninhabited islet in the Caribbean is the sanctuary of giant lizards.

A sinkhole known simply as "The Hole."

A collection of huge Pre-Colombian structures in Alabama.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

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

Elvis's own personal tropical hideaway.

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

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.