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

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

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

It's a pretty creepy lock-up.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

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

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

Florida castle built with aluminum printing plates.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

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

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

Like Mardi Gras, only everyone's a pirate.

This medieval castle was reconstructed by Carlo Scarpa.

Dedicated to "the father of U.S. life insurance."

Despite its extensive history, this fort saw little to no combat.

This stone in Lexington honors a formerly enslaved man who fought during the American Revolution.

This location holds the truth to what truly happened that faithful night.

Plans for this peninsula included houses, the United Nations Headquarters, and a nuclear power plant. When none of them worked out, it became an expansive park.

An ode to Japanese artist Hokusai, with a bit of a comical twist.

Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Abandoned Coast Artillery fort now serves as a graffiti canvas and sightseeing vantage point.

The secluded beach getaway from Wes Anderson's dreamy summer romance.

The shared home of a utopian commune that practiced "free love" a century before the hippies.