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

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

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

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

Largest gathering of hobos in the country has been meeting annually since 1900.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

No one knows the origin of this small town’s unique name.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

The magazine keeps a perfectly groomed display garden for its photo shoots.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

Eight feet in diameter and more than 24 feet around.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

An eclectic assortment of medieval architecture in a small Iowa town.

A mysteriously dark cemetery monument fuels stories and legends galore.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

An old town theater converted into a celebration of the hobo legacy.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.