Holmengrå is the only place in Hordaland where we find traces of the abrasion that is supposed to have transformed Western Norway from a Himalaya-like high mountain landscape during the earth's Paleozoic Era, to a flat lowlands terrain during the Mezosoic Era. Just 400 million years ago, large and small stones plummeted down from the high mountains. Some of these stones became incorporated into the conglomerate bedrock on Holmengrå.
Hamre Church has, by all accounts been one of the four main churches in Horda County in the Middle Ages. Hamre was a main church for the whole of Hordaland. Timber remains in the present church show that there was a stave church here in medieval times.
On Christmas Day 1795, at 5 a.m., the lightning struck the church in Hosanger. After three hours, the timbered church from the 1600s, which had replaced the stave church from the Middle Ages, was in ashes. Already on New Years Day in 1796, a sermon was held for the Hosanger population in the main church at Hamre, to which the congregation belonged earlier,