The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

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

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

Even with only two residents and one building, this tiny Illinois town is famous for its burgers.

A notorious Route 66 eatery once frequented by Al Capone.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.

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

Locals dubbed this abandoned abode the "gingerbread house" because of its odd architecture.

This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.

Ornate limestone building now filled with geologic specimens, and more.

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

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

If astronomy had a ghost, it would look like this observatory.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A medical facility that has been kept frozen in time.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An abandoned theme park with a strange and tumultuous past.