Nancy Giles goes in search of hidden rooms, and finds some of them in the most unexpected places. She talks with Steven ...

Secret passageways to history Secret passageways, trap doors and hidden rooms were standard in some of your favorite mystery series – like "Scooby-Doo" or Nancy Drew. You probably saw them coming.

Take a virtual history class by scrolling through this gallery of 39 American landmark buildings that are still standing.