Location of a reliquary containing bone fragments of 18 saints.

"We Seceded Where Others Failed."

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

Like Mardi Gras, only everyone's a pirate.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

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

It's a pretty creepy lock-up.

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

North Central Florida's largest flea market and a weekend roadtripper's dream.

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

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

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

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

A much more welcome kind of snowbird vacationer, manatees camp out in these springs every winter.

A sprawling maze of used books piled from floor to ceiling.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

This zombie-themed restaurant stands out in the heart of corn country.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Community bookshelf of 25-foot-tall book spines.

This abandoned prison castle has become an imposing gallery of graffiti art.