Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

Located outside Medellín, this Colombian park focuses on conservation and sustainability.

Three hundred illuminated pillars form an “artificial forest” in Medellín.

Hot Doug's "Hot Dog" Stand.

Chicago’s incendiary role in the labor movement.

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

Huge abstract sculptures of the Puerto Rican Flag.

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

Illegal drag racing two stories beneath Chicago’s streets.

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

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

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

An eccentric park and pool.

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

Former bath house turns gastropub.

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

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

Where old school Polish Chicago and young hipster Chicago live side by side.

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

A beloved Chicago music venue offering cold beer and lots of “Friendly."

The 606 is a decade in the making.

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

Beloved bar home to musicians of all eras and reputations.

Cemetery featuring rare glass-fronted columbarium.