O Street Museum - secret doors and hidden rooms

The O Street Museum Foundation is a private museum and event space known for its eclectic collections of music, literature, and fine art and for containing more than 100 secret doors, hidden rooms, and passageways across its interconnected rowhouses and carriage house. The museum markets the secret doors as a distinctive feature and offers timed tours and reservations to explore the spaces. Because the layout is intentionally maze-like and access is by guided visit or event, many of its rooms are easy to miss without a scheduled tour.