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

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

A picture-perfect town, perfect for blowing up.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

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

How did a 2,000-year-old Roman column find its way to a Chicago park?

A relic of the Cold War in Chicago.

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

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

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

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.

Illegal drag racing two stories beneath Chicago’s streets.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

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

This small, but long-running hobby club has built one of the largest model rail lines in the US.

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

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.