The Mainhardt Castle is a former Roman cohort fort on a section of the UNESCO World Heritage Site " Obergermanisch-Raetischer Limes " (Front Limes) in the area of today's community Mainhardt in the district Schwäbisch Hall , Baden-Württemberg . The few remaining visible parts of the facility in the area of the local school are freely accessible. Finds can be visited in the Roman Museum on site.