MAE340546: View of the castle (photo) / Bridgeman Images

XPC341651: South rose window (photo) / Bridgeman Images

VHP342390: Bologna (albumen print) / Bridgeman Images

HGP362471: Norman Tower, Norwich Cathedral (photo) / Bridgeman Images

HGP362826: Walmer Castle (photo) / Bridgeman Images

NUM407081: Capital with man between lions (photo) / Bridgeman Images

JB24650: Exterior view, Rochester Castle, Kent (photo) / Bridgeman Images

JFS136524: Lion from the portal, 12th century (photo) (see 136523 and 136525) / Bridgeman Images

MAE3469550: Church of Saint Anne of Nohant, Nohant-Vic, Centre, Indre, France (photo) / Bridgeman Images

LGM3552166: Rocamadour (photo) / Bridgeman Images

XIR316381: A lookout gives the alarm, illustration from the Jewish Cervera Bible, 1299 (vellum), Ha-Zarefati, Joseph (fl.1299) / Bridgeman Images

AMO1218058: The North Porch of San Fermo Maggiore, Verona, Italy, c. 1884 (watercolour on wove paper), Randal, Frank (1852-1917) / Bridgeman Images

DGA2574684: Church of Augustinian convent, 1270, Vila Vicosa, Alentejo, Portugal, 13th century / Bridgeman Images

DGA1090497: Italy, Emilia-Romagna region, Piacenza Hills, Castell'Arquato and Rocca Viscontea, Visconti Fortress / Bridgeman Images

UDK837931: Italy, Tuscany, Pitigliano, medieval Etruscan town on rugged outcrop, floodlit / Bridgeman Images

UDK834940: Switzerland, Berne Canton, Lake Thun, Oberhofen, Schloss Oberhofen (Oberhofen Castle), circular turret of lakeside castle dating from 12th century / Bridgeman Images

CDR5972845: Engraving of Eastbridge Hospital, Canterbury, 1785 (paper), Raymond and Cook (fl.c.1785) / Bridgeman Images

DGA3938900: Fortress, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938902: Portcullis, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938921: Embrasure, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938931: Fortifications, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938933: Fortifications, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

DGA3938935: Fortifications, copperplate engraving from Diffesa et Offesa Delle Piazze, by Pietro Paolo Floriani, published by Giuliano Carboni, Macerata, 1630 / Bridgeman Images

TMA396224: St David's Cathedral, Pembrokeshire (b/w photo) / Bridgeman Images

TMA396277: Orford Castle, Suffolk (b/w photo) / Bridgeman Images

USB465686: The Gothic Tower (photo) / Bridgeman Images

JFS138000: Rose window from the west facade, San Pietro, Tuscania, Lazio, Italy (photo) / Bridgeman Images

DGA765301: Historical city, miniature by Master of the Biadaiolo Codex (active 14th century), from The human mirror, by Domenico Lenzi, manuscript, Italy, 14th century / Bridgeman Images

ELC434091: The Effects of Good Government in the City, 1338-40 (fresco) Effects of Good Government, c.1338 (fresco) (detail of 434090), Lorenzetti, Ambrogio (1285-c.1348) / Bridgeman Images

FAF184762: Effects of Good Government in the City, detail of architecture and construction of a house, 1338-40 (fresco), Lorenzetti, Ambrogio (1285-c.1348) / Bridgeman Images

JEB4844772: Gothic architecture. Histoire de Charlemagne (detail): Charlemagne (742-814) and its preux. Stained glass of the northern ambulatory, absidial. Cathedrale de Chartres. / Bridgeman Images

UDK5433107: Spain, Catalonia, Castelfollit de la Roca, medieval village built on cliff edge / Bridgeman Images

TRK697343: Ukraine. Autonomous Republic of Crimea. Sudak. Genoese medieval Fortress. / Bridgeman Images

DGA533923: Italy, Tuscany, San Gimignano, Siena province, Medieval towers / Bridgeman Images

HGP833604: The Medieval Guildhall, King's Lynn, Norfolk (photo) / Bridgeman Images

LLE3102096: Cathedral, Palermo (colour photo), Italian Photographer, (20th century) / Bridgeman Images