An 18th-century Spanish watchtower made entirely of seashell and concrete.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

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

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The final resting place of New Orleans' most famous voodoo priestess.

Where serial killer Aileen Wuornos drank her last beer.

One of the oldest, tallest, and most haunted lighthouses in America.

America's first wax museum opened in 1948.

St. Augustine's record-setting narrow street was designed to protect against pirates.

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

A tribute to Ponce de Leon's supposed quest for eternal youth.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

Where beautiful signs live on forever.

A historic hotel library in Indiana hides more than a few secrets on its shelves.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

The longest navigable underground river in the United States is home to countless blind and albino animals.