TRK697285: Spain. La Rioja. Roman bridge of Cihuri over Tiron river. Rebuilt in the Middle Ages. / Bridgeman Images

TRK697130: Byzantine Church of St. John the Baptist, Kerch, Autonomous Republic of Crimea, Ukraine (photo) / Bridgeman Images

HGP1111467: Priory Gatehouse, Castle Acre, Norfolk (photo) / Bridgeman Images

HGP1073005: Baconsthorpe Castle, 15th century Inner Gatehouse, Moat and inner Court, Norfolk, UK (photo) / Bridgeman Images

XPC341162: West rose window, late 15th century (photo) / Bridgeman Images

TRK3700994: Krak des Chevaliers, Built by knights Hospitaller, 12th cent, Walls, Syria, Before Civil War / Bridgeman Images

GRL2655065: View of Palazzo Vecchio, Piazza della Signoria, Florence, Italy (photo) / Bridgeman Images

OLA5343559: Milan, la Piazza del Duomo, cathédrale de la ville. photo Belluschi / Bridgeman Images

BAT5472119: Chapelle des espagnols. Le triomphe de l'Eglise Catholique : La crucifixion. Fresque de Andrea Bonaiuto (ou Bonaiuti) dit Andrea da Firenze (1343-1377), 1365. Eglise Santa Maria Novella, Florence. ©Battaglini/Leemage / Bridgeman Images

LLM5208361: Construction of Murbach Abbey, near Guebwiller, Alsace (colour litho), Waltz, Jean-Jacques (Hansi) (1873-1951) / Bridgeman Images

LLM2793648: Rufus Castle (engraving), English School, (19th century) / Bridgeman Images

FBU5935169: Venitian fortress Castelfranco (1371-1374). / Bridgeman Images

FBU5935176: View over the inside of the Venitian fortress Castelfranco (1371-1374). / Bridgeman Images

MAE3469410: View of the choir windows, Soissons Cathedral, Nord-Pas-de-Calais-Picardie, Aisne, France (photo) / Bridgeman Images

MAE3469429: View of the altar, Eglise Saint-Ayoul de Provins, Ile-de-France, Seine-et-Marne, France (photo) / Bridgeman Images

MAE3469369: Detail of a carved capital, Noyon Cathedral, Nord-Pas-de-Calais-Picardie, Oise, France (photo) / Bridgeman Images

MAE3469378: View of an aisle, Noyon Cathedral, Nord-Pas-de-Calais-Picardie, Oise, France (photo) / Bridgeman Images

MAE3469380: View of a side chapel, Noyon Cathedral, Nord-Pas-de-Calais-Picardie, Oise, France (photo) / Bridgeman Images

TRK3708209: Spain, Umayyad period, Medina Azahara (936-960) Andalusia. / Bridgeman Images

JB24635: Exterior view of the Gatehouse, Kirby Muxloe Castle, Leicestershire (photo) / Bridgeman Images

KW383409: View of the beach and castle (photo) / Bridgeman Images

VLS875181: Church of San Martino, Randazzo, Sicily (photo) / Bridgeman Images

HGP407750: The Norman Gate, Bury St. Edmunds, Suffolk (photo) / Bridgeman Images

LLE819812: Harlech Castle in Harlech (b/w photo), English Photographer, (20th century) / Bridgeman Images

PC991728: Cosmati pavement, 12th century, Basilica di San Crisogono, Rome, Italy (photo) / Bridgeman Images

HGP1073000: Baconsthorpe Castle, 15th century Inner Gatehouse, leading to the inner Court, Norfolk, UK (photo) / Bridgeman Images

HGP1111481: Red Mount Chapel, King's Lynn, Norfolk (photo) / Bridgeman Images

HGP1111466: Priory Gatehouse, Castle Acre, Norfolk (photo) / Bridgeman Images

HGP362674: Ludlow Castle and town (photo) / Bridgeman Images

TMA396282: Bolsover Castle, Derbyshire (b/w photo) / Bridgeman Images

HGP405332: Fan vaulting, detail of the choir (photo) / Bridgeman Images

HGP399372: Angel on hammerbeam roof, Church of Our Lady St. Mary, South Creake, Norfolk (photo) / Bridgeman Images

SAP492264: Portal of Michael, North Facade, Cologne Cathedral, Germany, 2010 (photo) / Bridgeman Images

NCO833719: Ms. New Coll 380, f11r. The antiquities of the Cathedral Church of Saint Mary, Carlisle, drawn by Robert Carlile, 1795 (pen & ink and w/c on paper), Carlile, Robert (fl.1795) / Bridgeman Images

RUS447449: Street scene (w/c on paper), Prout, Samuel (1783-1852) (attr. to) / Bridgeman Images

MAE3469405: View of the south transept, Soissons Cathedral, Nord-Pas-de-Calais-Picardie, Aisne, France (photo) / Bridgeman Images