The world's third-largest scale model of the planets.

This lush 12-acre site was once named the finest Japanese garden in North America.

One of the world's earliest skyscrapers.

This hidden jockey “walk of fame” celebrates the winning riders of the Kentucky Derby.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

A giant wooden statue of one of the greatest pitchers in 19th-century baseball.

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

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

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

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

The secret city built by the Manhattan Project.

The statue mysteriously lost its head and left hand.

Before TV meteorologists, there were weather kiosks. This may be the last one in the United States.

Burial site of the notorious Chicago gangster.

The poet’s boyhood home is now dedicated to celebrating his life and legacy.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

Once a gas station, this flightless airplane beside the Old Dixie Highway now houses a barbershop.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

The final resting place of the hero of Air Florida Flight 90 known as "the man in the water."