A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

Race through the maze, get your name on the sign.

Hot Doug's "Hot Dog" Stand.

The palatial McDonald's that inspired Wesley Willis.

Huge abstract sculptures of the Puerto Rican Flag.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

No one knows how many bodies are in this vault in a Chicago public park.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

Illegal drag racing two stories beneath Chicago’s streets.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Home to a protest movement, a bombing, and a dramatic change in labor history.

A hot dog stand where the heads are just as hot as the dogs.

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

The 606 is a decade in the making.

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

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Former hotel turned into haunted playground.