Built 1114 - 1400. Exeter Cathedral is a testament to the creativity, skill and devotion of those who built it. Dating back 900 years, it is one of England's most beautiful medieval cathedrals and one of the finest examples of decorated Gothic architecture in this country. It is most famous for its two Norman towers, impressive west front carvings and the longest unbroken stretch of Gothic vaulting in the world. Of note are the Minstrels' Gallery, the 15 Century Astronomical Clock, a complete set of Misericords and the highly decorated tombs, bosses and corbels. The library contains the famous 'Exeter Book' of Anglo-Saxon verse, the Exon Domesday and many other historical documents. The Cathedral's ceiling is approximately 96m or 315ft long, This is the longest continuous medieval stone vault in the world. This style of vaulting is known as 'tierceron'. The round stones or 'bosses' of the vault act as keystones locking the vaults of the Cathedral in place. Exeter Cathedral has more than 400 bosses, carved with a variety of Gothis images including plants, animals, heads, figures and coat of arms. Most of the pipes of the organ above the Pulpitum screen are housed in a case made originally by John Loosemoore in 1665. The Pulpitum is a stone screen across the eastern side of the crossing, in the centre of the cathedral. There are 13 paintings of biblical scenes which were added in the 17th century.