This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

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

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

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

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

This mysterious hill seems to pull objects uphill.

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

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.