The Historisches Centrum is Hagen's municipal history museum, housed across two buildings near the Eilper Tunnel — the Stadtmuseum in the former rectory, and the Schloss Werdringen on the Volme. The Werdringen wing displays prehistoric and Roman finds from the surrounding caves and the medieval history of the region; the Stadtmuseum tells the story of Hagen from its industrial growth in the 19th century onward.
The museum is small and methodical, but the building is beautiful and the prehistoric collection — including ice age bones from Blätterhöhle cave just outside the city — is more interesting than you would expect. Closed Mondays. Entry is free with the Hagen day card.