The United States's largest hand-dug well is topped with a state-of-the-art museum.

"The Most Boring Road in the State."

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Trinkets and toys lovingly handmade by maximum security prisoners.

Rural churches in the middle of nowhere with religious frescoes by famous artist.

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

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

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

Location of a reliquary containing bone fragments of 18 saints.

It's a pretty creepy lock-up.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

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

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Built to replace a house destroyed by a hurricane, this home is made entirely of shipping containers.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

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

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

A hands-off space for graffiti artists to hone and display their skills.

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