These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

A suspended garden, now gone, once hung in the middle of this abandoned church.

The world's longest known cave system.

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

Prehistoric animals decorate this popular outdoor park.

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

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

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

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

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

A rural hall of justice holds the world's only comic book and superhero museum.

One-layer pyramid in Indiana.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

A singular collection of hand-built art deco cars are held in a building with style to match.

A large collection of motorbikes with some impressive gems.

This former office building has been transformed into an immersive music venue and art space.

More than 3,200 cookie jars line the walls and shelves of this little shop and over 1,000 salt and pepper shakers

Nature and art meet in this curvy creation

One man's goal to be surrounded by color resulted in this enchanting assortment of avian abodes.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.