The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

World's second largest particle accelerator, where nature reveals its secrets.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

A hollow cement depiction of time's inexorable effect on the human body.

First planned industrial community in the United States.

The final resting place of the world's first nuclear reactor.

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

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

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

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

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 medical facility that has been kept frozen in time.

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

This mysterious hill seems to pull objects uphill.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

Moving, mind-blowing metal sculpture work of an outsider artist.