This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

All that remains of this abandoned coal town is a beautiful, haunting cemetery.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

An abandoned Cold War missile radar site.

A crumbling mountain resort that looks like it was abandoned in an instant.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

This Old West prison built into the side of a cliff was said to be inescapable.