This house designed by Frank Lloyd Wright and Louis Sullivan was destroyed twice and reconstructed to near original condition.

The secret city built by the Manhattan Project.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

A mountaintop space observatory that is certified dark.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

This former maximum-security prison is creepy, sobering, and supposedly haunted.