Hellisøy lighthouse was lit for the first time in 1855. The characteristic red cast-iron tower with two white belts is 33m high and a light height of 46m above high tide.
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.
In the Islandic Landnåmabok there is a story that the explorer Floke Vilgjerdsson built a cairn “where meetest Hordaland and Rogaland” and the cairn was named Flokavarði. Tormod Torfæus wrote in Historia Norvegica (1711) that this name was still in use, but that the farmers used “Ryvarden” for the same place.