Archaeologists excavating the house George Washington lived in when he was president discovered something unusual: a hidden passageway and other ruins used by his nine slaves.
The underground passageway is just steps from the Liberty Bell and Independence Hall. It was designed so Washington's guests would not see slaves as they slipped in and out of the main house.
"As you enter the heaven of liberty, you literally have to cross the hell of slavery," said Michael Coard, a Philadelphia attorney who leads a group that worked to have slavery recognized at the site. "That's the contrast, that's the contradiction, that's the hypocrisy. But that's also the truth."