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

An enormous park-like oasis, full of famous Chicagoans' graves.

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

A Bibliophile's Dream.

One of the last functioning antique elevators in Chicago.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

This historic hotel invented the chocolate brownie.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

No matter what it might seem like on film, most scenes filmed on a plane are filmed at this LA studio.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

Advice-columnist's bell tower, paid for with pennies.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

Detroit housing collective working to create an "environment for revolutionary change."

Detroit’s downtown castle is one of the oldest structures in the city.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

Collective made up of artists, musicians, and activists.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

Enormous small-business mecca in the Midwest, serving dozens of artists.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.