To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

This historic hotel invented the chocolate brownie.

These abandoned grain silos and tunnels are an urban exploration dream.

This empty Detroit high school was too expensive to maintain or destroy.

To find the "unicorns of the deep" you've got to go downstairs.

The only surviving prototype for Buckminster Fuller's house of the future.

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

A hollow cement depiction of time's inexorable effect on the human body.

An ever-evolving wall of graffiti art off East Liberty Street.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

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

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

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

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

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

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

An art deco ice cream shop covered in vintage train station tiles.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

An abandoned theme park with a strange and tumultuous past.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

This candy shop has been serving up sweets to the Louisville area since the 1850s.