The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Landmark Chicago building narrowly avoided destruction.

A long lost multi-cultural music venue used to reside in the bottom floor of Chicago's Flat Iron Building.

Illegal drag racing two stories beneath Chicago’s streets.

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

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

"No writer ever gave more to a city and got back less.”

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

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

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

One of the last functioning antique elevators in Chicago.

An avant garde art museum at the University of Chicago.

A display of magnificent stained glass windows is the first exhibit of its kind.

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

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

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

This historic hotel invented the chocolate brownie.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A lush green oasis in the middle of Chicago.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

A hugely vast Irish landscape of barren rock that stretches for miles.

This short bridge is the only thing connecting a tiny Irish island to the mainland.