This hands-on math museum believes in turning concepts into constructs.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

A mocking tribute to the past and modern leadership of Prague.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

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

This North Carolina store preserves a historic moment in America's movement for racial equality.

A sculptor's dream castle turned fantastical ruin.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Ruins of an American Civil War iron forge still survive today.

Rotting dome home spotted near Chapel Hill, North Carolina.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

A white oak with property rights.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

An abandoned railroad tunnel forgotten by time awaits inquisitive hikers.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

A colorful square marks the heart of the city's LGBTQ community.

Scattered around Atlanta are little doors with big charm.