This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

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

Kentucky's longest operating jail is now a spooky spot to spend the night.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

A gregarious Ohio resident has been building his whimsical temple to peace for decades.

Indiana's oldest sternwheel paddleboat has been plying the placid waters of Webster Lake for 90 years.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

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

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The highest point in Indiana is curated by an Eagle scout but may be in danger of losing its record to a nearby garbage pile.

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

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

One tree's homage to soles past and present.

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

One man's vision and a labor of love of many.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

The only freestanding table rock formation east of the Mississippi.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

The first spinning jail built in the United States is the only one that still turns.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Nature and art meet in this curvy creation