On Gardskagi you can find two lighthouses, the older one and also the smaller of the two was once regarded as one of the best lighthouses in Iceland because it stood low and therefore mist was not a problem. Although there was risk of the lighthouse being damaged because of surf and it was sometimes not visible because of seastorm.
A new lighthouse was built on Garðskagi in 1944. At 28 metres it is the highest lighthouse in Iceland and was in second place in a survey which Rögnvaldur Guðmundsson supervised concerning the favorite lighthouses of the Icelandic people. Engineer Axel Sveinsson designed the lighthouse but the lighthouse is a radar transponder and used for weather surveilance. The operation of the
lighthouse is under the supervision of the Icelandic Maritime Administration.