One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

This state park was once an important Native American cermonial center.

World's largest magnetic research facility.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

More than five miles of underground passageways.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Live long and prosper in Tennessee.

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 posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

This twisty sign depicts the chain's first logo.

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

A statue honoring 44 continuous years of greeting passing ships.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Where serial killer Aileen Wuornos drank her last beer.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

Owned by no one but beloved by all, Brownie was a good dog.

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

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A haunted hill that supposedly defied gravity.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

Like Mardi Gras, only everyone's a pirate.