A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

An antiquated German apothecary on Chicago's North Side.

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

One of the last functioning antique elevators in Chicago.

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

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

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

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

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

A place to eat for on-the-run agents and espionage enthusiasts.

A unique botanical garden housed in three giant geodesic domes.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

A river with some unusual, and occasionally dangerous, habits.

A six-story-tall golden pyramid, surrounded by a moat.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."