The Pearl (Perlan) is a remarkable building, built in 1988, unique in Iceland and probably in the whole world. On Oskjuhlid hill, atop the huge tanks in which natural hot water is stored for heating the city, a glass dome has been constructed: under the dome is a rotating restaurant serving fine cuisine. Below the dome, between the hot-water tanks, is a spacious atrium where various exhibitions and other events are held. Inside the building is a small artificial geyser which spouts every few minutes.