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At the bottom of Vargavågen on Halhjem lies Grødalshaug, a 30 metres high rocky outcrop between the bay and a moist valley cleft. On the south side of the rock is a steep rock cliff facing the valley, the bog and the stream. On this rock face we find rock carvings from the Bronze Age.
Numerous finds show that the settlement at Herdla goes back to prehistoric times, and the large estate at Herdla has enjoyed a central place in the nation’s history since High Middle Ages. As Ask, Herdla was part of the country estate Harald Hårfagre took over as he took command of the west of Norway.
The prehistoric site at Årbakkasanden with menhirs and burial mounds has been visited, described and illustrated by many learned researchers through the last 350 years. All the same, we still know very little of this unique cultural monument.