HGP2629379: The Medieval Keep, Helmsley Castle, Yorkshire (photo) / Bridgeman Images

HGP2629380: The Medieval Keep, Helmsley Castle, Yorkshire (photo) / Bridgeman Images

FBU4235670: Medieval walls and turrets of Avignon (14th century) UNESCO class site / Bridgeman Images

LLJ608222: Medieval Court, Crystal Palace, Sydenham, London (photo), English Photographer, (19th century) / Bridgeman Images

DGA2826431: Walls of Castle of Mytilene, Lesbos island, Greece, 6th-13th century (photo) / Bridgeman Images

HGP362536: Orford Castle (photo) / Bridgeman Images

STF452299: View of a Byzantine building, probably a hospital, Side, Turkey (photo) / Bridgeman Images

XPC341189: Sacristy rose window, c.1170 (photo) / Bridgeman Images

UIG1570956: Clock of the House of the Blackheads, Riga, Latvia (photo) / Bridgeman Images

UIG1570958: House of the Blackheads at Night, Riga, Latvia (photo) / Bridgeman Images

UIG1570978: Street Scene in the Old Town, Riga, Latvia (photo) / Bridgeman Images

LLM3096603: York Minster (b/w photo), English Photographer, (20th century) / Bridgeman Images

UIG2918063: St Sofia Church (photo) / Bridgeman Images

STF696222: Ulm Minster, Germany (photo) / Bridgeman Images

POV1076976: Mehrangarh Fort on rocky hill behind Jaswant Thada above the Old City at sunrise, Jodhpur (The Blue City), Rajasthan, India / Bridgeman Images

KW6267043: Bridge at Cangas de Onis, Asturias, Spain, 2016 (photo) / Bridgeman Images

MAE3469548: Church of Saint Anne of Nohant, Nohant-Vic, Centre, Indre, France (photo) / Bridgeman Images

SCN3249127: View of the Lutheran Cathedral, Tromso, Norway (photo) / Bridgeman Images

SCN3249133: View of the Lutheran Cathedral, Tromso, Norway (photo) / Bridgeman Images

BAG2831469: One of the cusps of Canynges' Tomb in St Mary Redcliffe (w/c on paper), Manning, Joseph (c.1801-1861/1871) / Bridgeman Images

MES3470008: St. Mark writing the gospel (fresco), Italian School / Bridgeman Images

GCL3395839: THE HAGUE: RIDDERZAAL Interior of the Knights' Hall in The Hague, the Netherlands, one of the largest secular Gothic buildings in Europe. Photograph, c.1980. / Bridgeman Images

DGA518361: The medieval Castle in Casaleggio, Italy, 19th Century Engraving from La Patria. / Bridgeman Images

WOL3872972: Carcassonne / Bridgeman Images

WOL3872975: Carcassonne / Bridgeman Images

UDK835933: Spain, Catalonia, Castelfollit de la Roca, medieval village built on cliff edge / Bridgeman Images

UDK836173: Italy, Lazio, Viterbo, old buildings with brown shutters and street lamp in city / Bridgeman Images

UDK837851: France, Loire region, flat steps leading up to castle entrance. / Bridgeman Images

KWE268366: Bridge, gateway and Cathedral of Burgos, illustration from 'Spanish Pictures' by the Rev. Samuel Manning (engraving), English School, (19th century) / Bridgeman Images

TMA396207: Rievaulx Abbey, Yorkshire (b/w photo) / Bridgeman Images

USB132533: View of the south front, Buckland Abbey, Devon (photo) / Bridgeman Images

USB180763: View of Wareham Village seen through the window in the Keep of Corfe Castle, Dorset (photo) / Bridgeman Images

JFS135112: Romanesque Door Pediment, Lucca, Tuscany, Italy (photo) / Bridgeman Images

JFS135802: View of the Town, with Camerata in the background, Izzalini, Umbria, Italy (photo) / Bridgeman Images

BAL6012: View of the west front of Rochester Cathedral, built c.1150 (photo) / Bridgeman Images

MUC176348: Aerial view Monteriggioni, Tuscany, Italy (photo) / Bridgeman Images