Cologne Cathedral (German: Kölner Dom, officially Hohe Domkirche St. Peter und Maria) is a Roman Catholic church in Cologne, Germany. It is the seat of the Archbishop of Cologne (currently Cardinal Joachim Meisner), and is under the administration of the archdiocese of Cologne. It is renowned as a monument of Christianity, of German Catholicism in particular, of Gothic architecture and of the continuing faith and perseverance of the people of the city in which it stands. It is dedicated to Saint Peter and the Blessed Virgin Mary. The cathedral is a World Heritage Site, one of the best-known architectural monuments in Germany, and Cologne's most famous landmark, described by UNESCO as an "exceptional work of human creative genius". Construction of Cologne Cathedral began in 1248 and took, with interruptions, until 1880 to complete – a period of over 600 years. It is 144.5 metres long, 86.5 m wide and its two towers are 157 m tall. The cathedral is one of the world's largest churches and the largest Gothic church in Northern Europe. For four years, 1880-84, it was the tallest structure in the world, until the completion of the Washington Monument. It has the second-tallest church spires, only surpassed by the single spire of Ulm Cathedral, completed 10 years later in 1890. Because of its enormous twin spires, it also presents the largest façade of any church in the world. The choir of the cathedral, measured between the piers, also holds the distinction of having the largest height to width ratio of any Medieval church, 3.6:1, exceeding even Beauvais Cathedral which has a slightly higher vault. Cologne's medieval builders had planned a grand structure to house the reliquary of the Three Kings and fit its role as a place of worship of the Holy Roman Emperor. Despite having been left incomplete during the medieval period, Cologne Cathedral eventually became unified as "a masterpiece of exceptional intrinsic value" and "a powerful testimony to the strength and persistence of Christian belief in medieval and modern Europe".