The final resting place of the world's first nuclear reactor.

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

This colorful monument commemorates a little-known story from the life of Abraham Lincoln.

The world's largest covered wagon is piloted by a giant Lincoln lawyer.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

The empty tomb that houses the memories of Roy Bertelli's revenge.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Once one of the largest producers of pig iron in the world.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

A six-story-tall golden pyramid, surrounded by a moat.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

These pretty kitties killed and ate as many as 135 railway workers.

Years of archaeology, just chillin' by the water cooler.

To find the "unicorns of the deep" you've got to go downstairs.