The world's first aircraft factory has been hiding inside an automobile plant for almost 80 years.

An art deco ice cream shop covered in vintage train station tiles.

This magnificent Cincinnati graveyard is also a popular public park.

A county library in rural Ohio houses one of the finest mineral collections in the world.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

A memorial for an outsider theorist who believed that the planet is actually hollow.

Inside, ancient treasures. Outside, modern contradictions.

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

This unassuming home was once “grand central station” for the Underground Railroad.

This shop is named for a runaway elephant who smashed through its doors, stole some peanuts, and spent five days on the lam.

A wartime promise becomes a shrine to Our Lady of Lourdes.

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

One-layer pyramid in Indiana.

The lynching and burial site of America's first train robbers.

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

One tree's homage to soles past and present.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

The world's largest anatomically accurate brain sculpture.

This mysterious hill seems to pull objects uphill.

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

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

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."