Borre mound cemetery are ancient Burial Mounds from the Viking period

burrial mound tumulus vestfold county grave grass burried horse barrow vikingera viking age excavations era central national heritage board borre national park oppdal archaeologist norsemen cultural heritage ancient tree viking colonization raids enemies midgard antiquarian brutal discover helmet viking ship norway borre death historical ceremony odin conquest history sword prehistoric riding equipment trade research weapons friend raiders harbour jewelery warrior thor