DGA754213: Central aisle of St Lawrence (San Lorenzo) Cathedral, Genoa, Italy, 12th-13th century / Bridgeman Images

DGA913842: Saints, Church of St Mary (13th-18th century), Olite, Navarra, Spain / Bridgeman Images

DGA914350: Birth of Romulus and Remus, detail from fresco cycle Stories of Romulus and Remus, by Gentile da Fabriano (ca 1370-1427) and collaborators / Bridgeman Images

DGA910856: Last Judgment, detail of bas-relief by Lorenzo Maitani (died in 1330) on right pillar of facade of Orvieto Cathedral, Umbria, Italy / Bridgeman Images

DGA1130197: St Peter of Simbranos church, 1113-1120, Bulzi, Sardinia, Italy / Bridgeman Images

DGA1129874: Sarzanello fortress in Sarzana, 10th century, residence of Castruccio Castracani, Liguria, Italy / Bridgeman Images

DGA1129897: Cloister of the Clairvaux Abbey, 12th or 13th century, Milan, Lombardy, Italy / Bridgeman Images

DGA1131112: People's church (1741), Lucedio abbey (12th century), Lucedio village in Trino, Trino Partecipanza Woods Regional Park, Piedmont, Italy / Bridgeman Images

DGA1131113: Abbey church with Lombard Gothic style bell tower on octagonal base, Lucedio abbey (12th century), Lucedio village in Trino, Trino Partecipanza Woods Regional Park, Piedmont, Italy / Bridgeman Images

DGA1131378: Ruins of Fountains Abbey, Founded in 1132, Studley Royal Park (Unesco World Heritage List, 1986), North Yorkshire, United Kingdom / Bridgeman Images

DGA1131374: Remains of eastern tower, Ruins of Helmsley castle (circa 1120), North Yorkshire, United Kingdom / Bridgeman Images

VIB396569: Whitby Abbey, 1900 (oil on board), Goodwin, Albert (1845-1932) / Bridgeman Images

DGA419167: The wooden Church of Saint George (photo) / Bridgeman Images

DGA555354: Caring for patients, miniature from The Cantigas de Santa Maria Alfonso X the Wise, manuscript / Bridgeman Images

NGF476468: Karl Knutsson Leaving Viipuri Castle in 1448, Being Selected King of Sweden, 1886 (oil on canvas), Falkman, Severin (1831-89) / Bridgeman Images

DGA2589912: View of Churburg castle, 13th century, Schluderns, Venosta valley, Trentino-Alto Adige, Italy / Bridgeman Images

DGA2591192: Arab-Norman castle of Calatabiano, 10th century, Calatabiano, Sicily, Italy (photo) / Bridgeman Images

DGA2591193: Arab-Norman castle of Calatabiano, 10th century, Calatabiano, Sicily, Italy (photo) / Bridgeman Images

DGA993013: The planet Mars and a castle under siege, illustration from 'De Sphaera' by Leonardo Dati, 1470 (vellum), Italian School, (15th century) / Bridgeman Images

DGA1133040: Molina de Aragon castle, 12th-13th century, Castilla-La Mancha, Spain / Bridgeman Images

DGA1258844: Castle of Diosgyor, Miskolc, Hungary, 14th-15th century / Bridgeman Images

DGA1139402: UK, Wales, Aerial view of Conwy Castle (photo) / Bridgeman Images

GCL3391085: GERMANY: ULM CATHEDRAL The Gothic minster of Ulm, on the Donau River in Baden-Württemberg, Germany, c.1975. / Bridgeman Images

XLA3760541: Birth house of Nicolaus Copernicus, Toru?, Poland / Bridgeman Images

EHT3620019: Detail view of Christ with seraphim and the evangelists, on the chancel ceiling, c.1130 (fresco), English School, (12th century) / Bridgeman Images

SRB6367303: View of the watchtower at Gruissan in Languedoc-Roussillon, France, Aude, Gruissan, village in Circulade testifies of a Medieval origin, strategic sign of defense and Christian symbol, 2020 (photo) / Bridgeman Images

LUX4714247: France, Pays de la Loire, Sarthe (72), Le Mans: General view, old quarter of Le Mans with its wooden houses and the famous medieval bridge over the Sarthe, 1860 / Bridgeman Images

FBU4245519: Underground rooms for soldiers and also used for storage Medieval Castle of Kolossi, Built in the 13th century (1210) by the martial order of Hospitallers of Jerusalem The castle was rebuilt by Louis De Magnac, Grand Commander of the order of Hospitallers, in the 15th century (1454) Limassol region, Cyprus / Bridgeman Images

IMO8849961: Rabenstein Castle 10 06 1991, Chemnitz, Rabenstein, architecture …, 1991 (photo) / Bridgeman Images

DPS3256412: Grey Abbey, Co Down, Ireland; 12Th Century Cistercian Abbey (photo) / Bridgeman Images

TRK697218: View of the city of Tarazona with the Mudejar tower of the Cathedral and the dome, Aragon, Spain (photo) / Bridgeman Images

DGA758244: Glimpse of the interior, Basilica of San Vitale (UNESCO World Heritage List, 1996), Ravenna, Emilia-Romagna. Italy, 6th century. / Bridgeman Images

DGA758278: Angels with an apocalyptic cross, mosaic, above the lunette, northern wall of the presbytery, Basilica of San Vitale (UNESCO World Heritage List, 1996), Ravenna, Emilia-Romagna. Italy, 6th century. / Bridgeman Images

DGA758923: Glimpse of carinated wooden ceiling, Basilica of San Zeno, Verona (UNESCO World Heritage List, 2000), Veneto, Italy, 14th century / Bridgeman Images

DGA628183: Holy Apostle, wooden relief from the upper chapel of the Holy Chapel, Paris, Ile-de-France, France, 13th century / Bridgeman Images

DGA576315: Italy, Emilia Romagna region, Ravenna, Basilica of San Vitale, Apse half-dome, mosaic representing Christ with two Angels, Saint Vitale and Bishop Ecclesius, Byzantine School, (6th century) / Bridgeman Images