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

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

Nature and art meet in this curvy creation

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

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

Symbolic attempt to overcome the issues of life.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A medical facility that has been kept frozen in time.

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.

Veritable museum of 20th century country music history.

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

A wonderland of caves in eastern Iowa.

Step back in time while shopping inside this local store.

An underground wonderland in Iowa.

How did the 110-foot limestone statue cross the road?

This 16-foot-diameter wooden coin has been standing in Iowa City since 2006.

Hidden in the grounds of the Fort Dodge Museum is a "real" and terrifying petrified giant.

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.

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

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

This simple home was the beginning of a long journey for the iconic Western film star.

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