A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

Electrical pylon in the shape of Disney's beloved mouse.

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

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

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

"We Seceded Where Others Failed."

A monument celebrating the idea of reaching inaccessible places.

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

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

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

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

An acoustic anomaly with a mysterious cause.

A building so large that it has its own weather.

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

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

Remarkably realistic Florida shoal bass "swim" inside this large globoid sculpture.

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