This abandoned secret city is a crumbling wonderland of Soviet ruins.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The highest point in Washington state is a volcano covered in glaciers.

A world-class observatory in the California desert.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.