Medieval stairs, galleries and upper chambers in cathedrals, abbeys, and parish churches have been an enduring source of fascination to historians and archaeologists since the eighteenth century, but their practical purposes have long been shrouded in mystery and speculation. From libraries to lights, clocks to dovecotes, from secret games of skittles played over the vaults to the daring exploits of the twelfth-century Flying Monk, Toby Huitson explores the lofty spaces, nooks and crannies of medieval upper spaces though the interrogation of a wide range of documentary, visual and archaeological materials. Evidence is revealed for over 30 different functions during the period from around AD 1000 to 1550. Generously illustrated and fully-referenced, the text is accompanied by a set of special features and a quick-reference section, making it indispensable to all those interested in medieval history and architecture.