 These historical meadows lands were cultivated in the 19th century and have hardly been altered since, as several well-preserved 18th century farmyards bear witness to.The oldest archaeological remains on Adelsö, found north of Hovgården, are grave fields and burial mounds from the Bronze Age (c. 1800-500 BCE).Apparently this culture survived into the Iron Age (500-800 CE) as graves from the early part of this period have been found at several locations in the area.