Perlan ( English: The Pearl) is the number one attraction in Reykjavík and the biggest nature museum in Iceland. It´s also a prominent landmark in the Icelandic capital of Reykjavík. It is situated on the top of Öskjuhlíð hill. It was initially only a cluster of hot water tanks, but on 1991 June 21st, the building was inaugurated and opened to the public.