This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

A naturally mummified 2,000-year-old man.

This historic sunny-yellow building has an unfortunate connection to the sinking of the Titanic.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A full-scale replica of a 1774 colonial settlement in Kentucky.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Perhaps the most scandalous statue of America's first president.

Rare recess caves fill this unbelievably beautiful Ohio park.

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

The world's longest known cave system.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.