The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

The first permanent memorial to a unique secret weapon of World War II.

This small, unassuming street is now a canvas for color and creativity.

A mysterious "wedding cake" castle in the middle of the urban desert.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

Hidden on the seventh floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

This monument owes its name to a quote by the famous civil rights activist and journalist.

A relic of the Cold War in Chicago.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

Once an ornate movie theater remade by Catholic Charities.

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 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.

A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

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

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

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

A chance to follow in the footsteps of the word's most legendary animator.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.