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

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A building so large that it has its own weather.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

Former villa and estate of James Deering developed to preserve native tropical forests.

Where monkeys run wild and the humans are caged.

A mysterious castle built as a monument to lost love.

When this test site was abandoned, they didn't even bother to take the rocket with them.

A monument celebrating the idea of reaching inaccessible places.

A nude beach alongside a washed-out road.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

This museum boasts the ninth-largest collection of insects in North America.

I Street Bridge is the heaviest swinging center bridge in the United States.

Experience a charming 1930s version of "infotainment."

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Oddly shaped rock formation, misassociated with a nearby utopian community.

San Francisco's newly reopened hands-on science museum.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This former rail stop in Utah was abandoned, repopulated by some nostalgic friends, and now is home to a single DIY aviator who lives in a hangar.

Keeping Ballard's heritage alive with delicious, lightly battered Alaskan wild cod.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.