The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Decades before the scandal, this staircase on the river was a literal "water gate."

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

Public works and national defense project meant to carve a canal all the way across the state of Florida.

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

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

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

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

This kitschy curio wonderland is full of fake animals, teak tables, and a cacophony of random bric-a-brac.

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

Where serial killer Aileen Wuornos drank her last beer.

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.

These mysterious ruins are hidden amid this sleepy coastal city.

Mariners once used this prehistoric landfill as a navigational landmark.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

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

Meet manatees face-to-face at this zoo for native species.

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

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

A building so large that it has its own weather.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.