TRK1018136: Tower of the Cathedral of Saint Martin. 14th century. Utrecht. / Bridgeman Images

MAE3469448: Cathédrale Saint-Etienne, Sens, Bourgogne, Yonne, France (photo) / Bridgeman Images

FAF3566802: Military parade for the ceremony of Selamlik, in Constantinople, at the time of Sultan Abdul Hamid, 1880 (print on double-weight paper) / Bridgeman Images

ARD2524544: Palazzo Abatellis, Regional Gallery of Sicily, Palermo, Sicily (photo) / Bridgeman Images

DSP3256276: County Waterford, Ireland; Reginald's Tower And Coningbeg Memorial (photo) / Bridgeman Images

DSP3256392: St Macnissi's College, Carnlough, Co Antrim, Ireland; Grammar School Also Known As Garron Tower (photo) / Bridgeman Images

DSP3254336: Rock Of Cashel, Co Tipperary, Ireland; Landscape With The Rock Of Cashel In The Distance (photo) / Bridgeman Images

DSP3254429: Dublin,Co Dublin,Ireland;Shop Fronts In Temple Bar (photo) / Bridgeman Images

LFG3898577: Man Reading A Pray On His Mobile Phone Inside The Friday Mosque, Isfahan Province, Isfahan, Iran, 2015 (photo) / Bridgeman Images

SRB3036779: Barcelona, Spain (photo) / Bridgeman Images

SRB3036782: Barcelona, Spain (photo) / Bridgeman Images

SCN3249118: Ruins of the Bishop's Palace, Kirkwall, Orkney, Scotland (photo) / Bridgeman Images

BAT5471271: Cathedrale Santo Stefano (Saint Stephane) de Prato. Architecture et facade commencees au 13eme siecle et achevees au 15eme siecle Architecture et decors : Guido da Como, Donatello et Michelozzo. Prato, Toscane, Italie ©Battaglini/Leemage / Bridgeman Images

SZT5978833: West portal of the Cathedral of Saints Maurice and Catherine, Magdeburg, Germany (photo) / Bridgeman Images

UTD2842413: Old guild halls in the Brussels city centre / Bridgeman Images

UTD2842034: Knight's chapel in the city of Hassfurt / Bridgeman Images

TRK2637104: Archivolt, Church of Santa Maria la Mayor, Valderrobre, Aragon, Spain (photo) / Bridgeman Images

XLF3787277: Plan of Canterbury Cathedral and Monastery / Bridgeman Images

PFH3614474: Italy: Bronze central entrance door, Cathedral of Saint Mary of the Assumption (Duomo di Siena), Siena / Bridgeman Images

PFH3614477: Italy: Saints and horse, facade right, Cathedral of Saint Mary of the Assumption (Duomo di Siena), Siena / Bridgeman Images

HGP2629391: Choir and south transept of Rievaulx Abbey, Rye Valley, Ryedale, Yorkshire (photo) / Bridgeman Images

HGP2629393: Transepts and choir of Rievaulx Abbey, Rye Valley, Ryedale, Yorkshire (photo) / Bridgeman Images

XJF277663: The Hobby-Horse (engraving) (b/w photo), English School / Bridgeman Images

CLF294248: Brinsop Court (b/w photo), Evans, Frederick Henry (1853-1943) / Bridgeman Images

CLF426084: Looking south from the battlements of Castle Drogo, from 'Edwin Lutyens: Country Houses' (b/w photo), English Photographer, (20th century) / Bridgeman Images

HGP809175: West front of priory church and Prior's Lodgings, Castle Acre Priory, Norfolk (photo) / Bridgeman Images

HGP809176: Detail of Norman Romanesque west front, Castle Acre Priory, Norfolk (photo) / Bridgeman Images

POV1202550: Dover Castle on White Chalk Cliffs, Dover, Kent, UK (photo) / Bridgeman Images

IMB4955244: Fortress above the historic town centre of Mithymna; Molyvos; Molivos; Lesbos; Aegean Sea; Greece; Europe / Bridgeman Images

FAF3564518: Group portrait photographed on a beach in Nettuno. In the background the medieval village / Bridgeman Images

FAF3558671: Medieval Tower in Buranaccio near Capalbio / Bridgeman Images

SZT3013311: Castle in Burghausen an der Salzach, 1933 (b/w photo) / Bridgeman Images

TEC4622632: The gargoyles of the Hotel de Cluny in Paris. One of the most beautiful monuments of medieval civil architecture in Paris elevated to the iniative of the Abbes of Cluny by Jacques d'Amboise (around 1440 or 1450-1516), brother of the cardinal minister. Restores after the ransacks of the Revolution, it now houses collections of sculptures and art objects from the Middle Ages. Renovated since 1991, the National Museum of the Middle Ages Thermes de Cluny. / Bridgeman Images

FAF3564441: Busy view of the countryside near Populonia. In the background the medieval fortress / Bridgeman Images

JB24676: Interior detail, Cardiff Castle, South Wales (photo) / Bridgeman Images

XYC281167: Ruins of the Savoy Palace, London (pen & ink with wash on paper), Girtin, Thomas (1775-1802) / Bridgeman Images