St Magnus Cathedral, built from red and yellow sandstone, is of international significance.
This 'fine minster' took about 300 years to build, the foundations starting in 1137. It was dedicated to Magnus Erlendsson, Earl of Orkney. He shared the earldom with his cousin, Haakon Paulsson, but jealousy and greed culminated in Magnus being martyred on the island of Egilsay.
The building is a fine example of a Romano-Gothic Cathedral. In 2007, the Cathedral was highly commended for the 'Best Historic Attraction - Cathedral/Abbey' award from the Icons of Scotland magazine.