Museum of the Order of Saint John

Housed in St John's Gate, a genuine relic of the medieval priory of the Knights Hospitaller, this museum traces the order's journey from crusading knights to the modern St John Ambulance service still recognized today. Reviewers consistently praise the knowledgeable tour guides for bringing the centuries-spanning history to life, contributing to a strong rating. Its high hidden-gem score reflects a small, free museum tucked into Clerkenwell that surprises those who find it with the depth of its story. At 50 minutes, it's a rewarding stop for anyone curious about medieval history or the origins of first aid.