Rather than focusing on grand events or elite figures, York Castle Museum celebrates the lives and material culture of everyday people. The museum houses extensive collections of costumes, domestic furnishings, crafts, and social history artifacts. Standout exhibits include faithfully recreated period rooms showing domestic interiors from different eras, an impressive historic costume collection spanning centuries, and the haunting Debtor's Prison with original cell reconstructions. The museum's approach is both scholarly and deeply human, inviting visitors to understand history through objects and spaces rather than academic text.

York Castle Museum opened in 1938, founded on the vision of Dr. John Lyons Kirk, who believed ordinary people's histories deserved preservation and display. The museum occupies two historic prison buildings—the Debtors' Prison (built 1701-1705) and the Female Prison (built 1780). The choice to preserve and interpret these buildings as part of the museum adds poignant historical resonance. The Debtor's Prison, in particular, reveals the brutal realities of 18th and 19th-century incarceration for those unable to pay debts. Today, the museum continues its founding mission: telling the stories of York's ordinary residents and presenting social history with depth and nuance.