10 Historic Secret Rooms and Hidden Passages

10 Historic Secret Rooms and Hidden Passages: "For all of humankind’s history, we’ve been fascinated with hidden places. Before they were a fun architectural addition to new homes, hidden rooms and secret passages served a purpose. Most often, that purpose was to allow someone to hide or escape from some kind of danger. At other times, though, they have served a much more sinister purpose. Here are ten notable hidden chambers, secret rooms, and concealed passages from throughout history from priest holes to royal escape routes."