UIG1572322: Saints Peter & Paul's Bastion, Valletta, Malta (photo) / Bridgeman Images

KWE441375: A Plan of 13th Century Antioch showing its Five Gates, c.1880 (litho), European School, (19th century) / Bridgeman Images

KWE3506114: The Holsten Gate aka Holstein Tor or Holstentor, Lübeck, Schleswig-Holstein, from L'Univers Illustre pub. 1867 / Bridgeman Images

HGP362783: Arden's House (photo) / Bridgeman Images

UDK838115: Tunisia, Kairouan, Great Mosque (Sidi Oqba Mosque), doorway to minaret, in centre of medina / Bridgeman Images

DGA925856: Barbican (16th century), defensive structure based on circular plan, Detail, Warsaw, Poland / Bridgeman Images

DGA539311: Italy, Emilia-Romagna region, fortress of Forlì / Bridgeman Images

DGA1088971: Fool on donkey (Fool is one who tries to predict future), 1467, Woodcut from Ship of Fools by Sebastian Brant (1457 to 1521), Incunabulum, 15th century / Bridgeman Images

FRM566449: Malbork, Marienberg, medieval fortress of the teutonic order; one of the worlds biggest surviving complex of gothic architecture, former capital of the Teutonic Order State, built 13th century, kitchens 2006 / Bridgeman Images

FLO4702921: The Rittershaal or Knights' Hall in Kleve castle, Germany, demolished in 1771. The hall was 126 feet long by 54 feet wide and had a barrel-vault ceiling. Handcoloured copperplate engraving from Robert von Spalart's Historical Picture of the Costumes of the Principal People of Antiquity and of the Middle Ages. / Bridgeman Images

GCL3349976: VEZELAY: ST. MADELEINE The 9th century abbey church of Saint Madeleine, Vezelay, France. / Bridgeman Images

XJF323042: Albrecht Durer's House, Nuremberg (b/w photo), German Photographer, (20th century) / Bridgeman Images

DPS3589850: Close up of medieval-looking wooden door, Ortnevik, Sognefjord, Norway (photo) / Bridgeman Images

HGP809197: The Medieval Guildhall and Gaol House, King's Lynn, Norfolk (photo) / Bridgeman Images

HGP1547468: Medieval historical re-enactment at Norham Castle, Northumberland (photo) / Bridgeman Images

BBG11779124: Saint-André cathedral, Bordeaux, Gironde, 2016 (photo), Bonnefon, Bernard / Bridgeman Images

BSI7205534: Urbino, Saint Francesco church and the bell tower (photo) / Bridgeman Images

DGA753468: Detail of buttress left of facade of Certosa di Pavia, Italy, 14th-16th century / Bridgeman Images

DGA642919: Evangelistria Church of Mistra, Greece, 14th-15th century / Bridgeman Images

DGA1133702: Chateau of Larroque-Toirac, 12th-15th century, Midi-Pyrenees, France / Bridgeman Images

BBG11778697: Royal portal, mid 13th century, detail: Last Judgement. 2016 (photo), Bonnefon, Bernard / Bridgeman Images

UDK834885: France, Penne-d'Argenais, pedestrians walking under arched entrance to remains of medieval 12th century walls / Bridgeman Images

IBE5338567: The Great Mosque of Samarra, detail of Minaret, 847-851 (sandstone) / Bridgeman Images

DGA913882: Ruins of building (10th century), Madinat Azahara, near Cordoba, Andalusia, Spain / Bridgeman Images

DGA914526: Tower, Chateau de Lucheux (12th century), Picardy, France / Bridgeman Images

DGA910438: Quseir Amra or Qusayr Amra desert castle, 8th century, Unesco World Heritage List, 1985), Jordan / Bridgeman Images

DGA1259148: Comares tower with Palace of Charles V in background, Alhambra (UNESCO World Heritage List, 1984), Granada, Andalusia, Spain, 13th-15th century / Bridgeman Images

DGA3126110: Bronze bells on lawn in cloister of Collegiate church of St Gertrude, Nivelles, Belgium, 11th century / Bridgeman Images

DGA3240692: Doonagore Castle, Doolin, Burren, Ireland, 16th century / Bridgeman Images

MEP3706760: Tomb of Antenor, 1283 / Bridgeman Images

JB24239: View of the west front, Peterborough Cathedral, Cambridgeshire, c.1200-10 (photo) / Bridgeman Images

XIR259897: View of the east end of the church, built 13th-14th century (b/w photo) / Bridgeman Images

MEP3706759: Tomb of Antenor, 1283 / Bridgeman Images

DGA570965: Italy, Lazio region, Latina province, Priverno, Cistercian Abbey of Fossanova, Cloister. Detail, Gothic columns / Bridgeman Images

ELC849330: Church of Santa Maria Assunta, 10th - 15th Century / Bridgeman Images

LLM2788721: Procession leaving Notre Dame de Paris during the reign of Charles VII of France, 1437 (chromolitho), European School, (19th century) / Bridgeman Images