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

A haunted hill that supposedly defied gravity.

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

One of the largest Native American shell middens stands 30 feet tall.

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

Mariners once used this prehistoric landfill as a navigational landmark.

These mysterious ruins are hidden amid this sleepy coastal city.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

The world's largest private aircraft collection.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

A swamp that was the site of prehistoric water burials also managed to preserve its corpses for millennia.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

Hundreds of skulls and bones at the largest skeleton museum in the country.

Home to a giant switchblade and one of the world's largest collections of pocket knives, this museum is a cut above the rest.

A vast array of tropical plants collected by a vacationing couple.

This historical art colony is adorned with thousands of hand-carved concrete sculptures in the Mayan Revival style.

Hidden in the plaza next to a pizza shop is an amazing little oddities shop.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

Flip your own pancakes in this old sugar mill within a Florida state park.

This picturesque ghost town is located on the banks of the Suwannee River.

The so-called "world's shortest river" is actually a window into a cave.

This abandoned bridge is now a favorite haunt for graffiti artists.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

Visitors to this shop will find fossils, minerals, meteorites, skeletons, oddities, and much more.