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

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This hauntingly beautiful stretch of Florida coastline is covered in sun-bleached trees.

This replica of a 16th-century French settlement memorializes one of the earliest attempts at a European settlement in North America.

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

A building so large that it has its own weather.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

Built following the War of 1812, this fort has withstood hurricanes for centuries.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The world-record holder for the longest bridge stretching continuously over water.

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

New Orleans' famous cemetery, located on the site of a former race track.

Anne Rice, one of the most influential writers in gothic literature, is buried alongside her husband in a New Orleans cemetery.

The tallest monument in a historic New Orleans cemetery was prompted by romance and dash of pettiness.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

This charmingly homemade amusement park has been growing for 40 years.

The wooden airship was the largest flying boat ever built.