[2] [3] Historical records from 400 years ago reveal that the island was just a sand bank, but over the years since, it has grown substantially, first due to the post-glacial rebound, but foremost due to artificial mass deposits.
The western tip of the island, called Holmenokken, is a public park where midsummer bonfires have been lit in later years.
The vantage point was used throughout the Cold War for surveillance of the Soviet-owned car import companies Konela and Koneisto, who had mostly Russian employees.
[6] The location of Holmen, at the mouth of the river, makes it crucial for the transport infrastructure of Drammen.
Finally, the railroad artery Drammensbanen crosses Holmen, with side tracks leading to the docks.