These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

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

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

Assemble a masterpiece at the first and only North American school exclusively dedicated to mosaic art.

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

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

The only Bahá'í house of worship in North America and one of only a handful worldwide.

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

An antiquated German apothecary on Chicago's North Side.

Former bath house turns gastropub.

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

The palatial McDonald's that inspired Wesley Willis.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This shop for all your super spy needs hides an educational secret.

This historic hotel invented the chocolate brownie.

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

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A century-old network of freight tunnels underneath the city's historic business district.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

A scattered trail of street art adds a pop of color to the city's stark structures.