Today, we're going to unearth 25 of history's dark skeletons - and when we say dark - we mean DARK. Here are 25 Dark Historical Secrets Kept Out of the Classroom. Uncover 25 Dark Historical Secrets ...

WATCH OUR OTHER VIDEOS: 25 Dark HISTORICAL SECRETS Kept Out of the Classroom: 25 Dark Secrets of Everyday Things: They changed the world, broke boundaries, and reshaped history. From powerful leaders ...

This week, NPR begins its series Off The Mark, about the nation's historical markers. There are more than 180,000 markers across the country. Have you ever stopped to read one? Well, NPR has spent the ...