Bad farming practices caused this unnatural natural wonder.

What started as three small gnomes at the base of a tree has grown into a full-blown gnome home.

This general store is stocked with memorabilia from the 1930s onward—almost none of it for sale.

This state park was once an important Native American cermonial center.

This now-deactivated naval base defended the Florida coast for centuries.

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

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

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

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

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

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

Arrr! The most authentic collection of pirate artifacts in the world... matey.

Where manatees are the snowbird vacationers in these balmy Florida springs.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The highest bridge in America was built for an almost unnervingly small amount of money.

The largest self-built castle in the U.S., six decades in the making.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

The only diamond mine in the world where you can keep what you find.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

A town pays homage to its namesake.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.