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

This mysterious hill seems to pull objects uphill.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

Ornate limestone building now filled with geologic specimens, and more.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

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

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.

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

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.

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

If astronomy had a ghost, it would look like this observatory.

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

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

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

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

A medical facility that has been kept frozen in time.

Dinosaurs invade a suburban Nashville neighborhood.

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

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

For decades, this waterfall remained hidden because of an artificial dam.

An elegant sandstone stairway built by the WPA still connects two neighborhoods in Akron.

A 30-foot stack of piano keys memorializes one of the greatest keys players in jazz history.

This restaurant proudly displays bread signed by the 39th president.