What else would you call a playground hidden in Alabama's oldest and largest cemetery?

One of the world’s largest living advertisements is made out of pine trees.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

A rare example of World War I trenches from the British front.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Washington's iconic carousel has a nice piece of Civil Rights history.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The most decorated dog of World War I is preserved in the Smithsonian.

"X" marks the spot of an echo chamber in the middle of a plaza.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

Bad farming practices caused this unnatural natural wonder.

This quirky curiosity shop takes its cues from the world's bazaars.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

World's largest Christmas store.

What was once the largest NFL stadium.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

A Beaux-Arts triumph set to become Ford's innovation campus

America's second-oldest brick baseball stadium was home to a legendary WWII series that only sailors got to see.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The maritime museum that boasts the largest nautical library in the western hemisphere.

Headquarters of the legendary clairvoyant's readings, spiritual hospital, and massage school.