Campus Martius Museum

The Ohio History Connection museum at the site of the original Campus Martius fortification, the central stockade built by the Ohio Company settlers in 1788. The museum preserves the Rufus Putnam house — the only surviving structure from the original fortification — within its walls. Exhibits cover the Ohio Company, the Northwest Ordinance, the frontier conflict of 1790–1794, and the establishment of territorial government. The Campus Martius name — "Field of Mars" — reflected the military character of the founding group and the precariousness of their situation.