The world's longest known cave system.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

An eerie smiling woman looms above the granite tombstones.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A modest walled graveyard where nobody is actually buried.

Georgia's first brewery is also one of its oldest surviving buildings.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.

This twisty sign depicts the chain's first logo.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

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

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

This unusual three-way wooden foot bridge spans two rivers at once.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

A devilishly named gorge that was a sign of salvation for many pioneers.

This 1920s railway depot is now home to two unique museums complete with a miniature train ride.

Visitors are welcome to enter this lush Key West sanctuary to entertain its plethora of rescued parrots.

In a city crazy for seashells this museum educates and amazes visitors using the wonder of cast-off exoskeletons.

The smallest post office in the United States is no bigger than a broom closet.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.