A crumbling hospital from the 1850s on Roosevelt Island.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

World's first "penitentiary," meant to be humane, drove men insane.

Rippling sand dunes frozen in the Arizona rock.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

World's largest collection of serial killer artwork and other macabre exhibits.

A science teacher's dream.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

The palatial McDonald's that inspired Wesley Willis.

A Chicago Movie Palace Lost to Time.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

A speakeasy takes on Chicago's drinking culture.

A lush green oasis in the middle of Chicago.

This shop for all your super spy needs hides an educational secret.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.