The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

America's first federal monument.

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

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

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

A mega theme park-wax museum mélange containing all things biblical.

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

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

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

A building so large that it has its own weather.

A self-explanatory attraction allows fans to respectfully remember and honor a comedy legend.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

Over 120,000 curious objects that have shaped our modern world.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

A perfect circle of 24 mysterious holes dates back to prehistoric times.

Located within a historic park, the beacon is the oldest standing structure in Miami.

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

This historical swimming pool near Miami is emptied and refilled each day with naturally filtered water.