DGA5186222: Bottom view of Gothic cathedral of Saint John the Baptist, Wroclaw, Poland, Polish School / Bridgeman Images

UIG3733109: The re-built medieval city walls of Warsaw / Bridgeman Images

DGA3030894: Medieval Aqueduct, 1256, Sulmona, Abruzzo, Italy, 13th century / Bridgeman Images

JB24656: Exterior view of Linlithgow Palace, West Lothian, Scotland (photo) / Bridgeman Images

IBE5343326: Arab Baths, Ronda, Spain, 13th century (photo), Spanish School, (13th century) / Bridgeman Images

UIG3733108: The re-built medieval city walls of Warsaw / Bridgeman Images

PWI101638: Exterior view of the fortress entrance, built in 1392-1407 by Louis I d'Orleans, dismantled in 1617 and rebuilt by Viollet-le-Duc (photo) / Bridgeman Images

DVY332991: Jorgen Olufsen's House (photo) / Bridgeman Images

DVY345164: Roof of the Choir (photo) / Bridgeman Images

GHL266789: South View of the Tower of London, engraved by J.C. Stadler (fl.1780-1812), 1795 (engraving), Farington, Joseph (1747-1821) (after) / Bridgeman Images

SAP490593: Donjon (keep), Arques Castle, France (photo) / Bridgeman Images

DGC473278: Town Hall Tower, Main Square, Krakow, c.1900 (b/w photo) / Bridgeman Images

IBE5339174: Gothic art: view of the facade of the cathedrale Notre Dame de Reims 1211-1311 (photo) / Bridgeman Images

UDK836046: Estonia, Tallinn, city walls / Bridgeman Images

FAF3573507: The Rocca Maggiore, or the Fortress of Albornoz, in Assisi / Bridgeman Images

BAG2831676: Groin stones (bosses) in the roof of St Nicholas' Crypt (pencil & w/c on paper), O'Neill, Hugh (1784-1824) / Bridgeman Images

BL3576716: 'Cour du Palais du Justice, Rouen', p.13, illustration from 'La France Pittoresque' by Jules Gourdault, 1893 (engraving), French School, (19th century) / Bridgeman Images

GCL3374026: POLAND: CASTLE View of the Furstenstein castle in Silesia, Prussia (present-day Poland). Wood engraving, English, 1875. / Bridgeman Images

JB24241: View of Ely Cathedral, Ely, Cambridgeshire, from the east (photo) / Bridgeman Images

DGA3484738: Sforza Castle, north side, Soncino, Lombardy, Italy, 10th-16th century / Bridgeman Images

UIG802260: satellite television dishes all over the old medina of Fez, Morocco. 10-02-2006. (photo) / Bridgeman Images

DGA550952: France, Loire valley, Plessis-Mace, Medieval castle / Bridgeman Images

DGA550958: France, Loire valley, Plessis-Mace, Medieval castle / Bridgeman Images

DGA575081: Italy, Sicily, Cefalù, catherdal, central apse, detail of mosaic / Bridgeman Images

DGA1080453: Croatia - Dalmatia - Zadar. Circular St. Donat's Church and bell tower at St. Stosija's Cathedral / Bridgeman Images

DGA1080457: Croatia - Dalmatia - Zadar. Cloister at Franciscan Monastery / Bridgeman Images

DGA646341: Spain, Castile and Leon, Burgos, Ruins of Burgos Castle / Bridgeman Images

DGA912008: Interior view of vaults of Franciscan Church (Franziskanerkirche), Salzburg, Austria / Bridgeman Images

JB148488: Church of the Intercession of the Holy Virgin on the Nerl (photo) / Bridgeman Images

UDK5432900: Estonia, Tallinn, Old Town, section of medieval wall with watch towers / Bridgeman Images

UDK5432979: Belgium, Antwerp, Begijnhof Antwerpen, terrace of 16th century medieval houses / Bridgeman Images

UIG543259: Portugal, Street In Obidos (Small Medieval Village). / Bridgeman Images

BAT237834: View of the Palazzo Vecchio and the city beyond (photo) / Bridgeman Images

HGP405323: Muchelney Abbey (photo) / Bridgeman Images

DGA914367: Jerpoint Abbey, Cistercian abbey, Founded in 1158, County Kilkenny, Ireland / Bridgeman Images

DGA646279: Switzerland, Fribourg Canton, View of Gruyeres Castle / Bridgeman Images