UTD2841543: Saint Valery sur Somme / Bridgeman Images

UTD2842622: A medieval tower, the Stortovet at the city of Oslo / Bridgeman Images

UTD2875680: View through an archway to the Dankwarderode castle, Germany 1930s (b/w photo) / Bridgeman Images

UTD2875692: View to the Dankwarderode castle at Braunschweig, Germany 1930s (b/w photo) / Bridgeman Images

SGM439063: Church of Our Lady before Tyn, Prague, Czech Republic (photo) / Bridgeman Images

ARD2524460: Palazzo Abatellis, Regional Gallery of Sicily, Palermo, Sicily (photo) / Bridgeman Images

LLM3093710: Meeting of Dante and Beatrice on the stairs of the Bargello in Florence (litho), Italian School, (20th century) / Bridgeman Images

TAD1747497: map of several medieval fortified castles in Normandy, engraving after drawings by Eugene Viollet le Duc 19th century / Bridgeman Images

DSP3503233: Dunluce Castle, Near Bushmills, Co Antrim, Ireland (photo) / Bridgeman Images

DSP3503765: Moyne Abbey, Co Mayo, Ireland; 15Th Century Franciscan Abbey (photo) / Bridgeman Images

DSP3249190: Silhouette Of St. Patrick's Church And A Franciscan Monastery On The Hill Of Slane, County Meath, Republic Of Ireland (photo) / Bridgeman Images

DSP3249960: Ballindoon Abbey, Lough Arrow, County Sligo, Ireland; Lakefront Historic Abbey (photo) / Bridgeman Images

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DSP3250221: Kilkenny Castle, Kilkenny, Co Kilkenny, Ireland (photo) / Bridgeman Images

DSP3255884: Co Leitrim, Ireland, Dromahair, Creevelea Friary, Franciscan Friary (photo) / Bridgeman Images

TRK2922537: Aachen Cathedral, Pala d'Oro, Carlolingian art, Germany (photo) / Bridgeman Images

TAD1747495: View of Carcassonne medieval fortified city, engraving after drawing by Eugene Viollet le Duc 19th century / Bridgeman Images

HGP362603: Dirleton Castle (photo) / Bridgeman Images

ITR7134908: Chapel of Saint Exuperus and Saint Julien, Cathedral of Our Lady of Bayeux / Bridgeman Images

DSP3503403: Devenish Island, Co Fermanagh, Ireland; High Cross And 12Th Century Round Tower In The Distance (photo) / Bridgeman Images

DSP3503429: Quin Abbey, Quin, Co Clare, Ireland; Franciscan Abbey Founded In 1433 (photo) / Bridgeman Images

DSP3250270: Dunguaire Castle, Co Galway, Ireland; Traditional Galway Hookers Racing During Kinvara Regatta (photo) / Bridgeman Images

DSP3253545: Buttevant Franciscan Friary, Awbeg River, Buttevant, County Cork, Ireland; 13Th Century Riverside Friary (photo) / Bridgeman Images

DSP3255941: Killyleagh, Co Down, Northern Ireland, Killyleagh Castle, Started 13Th Century (photo) / Bridgeman Images

TRK2922512: Inside view of Aachen Cathedral, Palatine Chapel designed by Odo of Metz (742-814), Carlolingian art, Germany (photo) / Bridgeman Images

DSP3503678: Puxley Manor, Co Cork, Ireland; Manor Believed To Have Been Burned By The Ira In The 1920's On The Same Site As Dunboy Castle (photo) / Bridgeman Images

GEG1783501: The square house / Bridgeman Images

DNA3798226: Narthex of the churches of the Patriarchate of Pec (photo) / Bridgeman Images

GRL5974206: View of the internal stairway, Ghirlandina Tower, Modena, Italy (photo) / Bridgeman Images

GRL5974078: The spiral staircase leading to the bell cell, Ghirlandina Tower, Modena, Italy (photo) / Bridgeman Images

FAF3558671: Medieval Tower in Buranaccio near Capalbio / Bridgeman Images

MEP1266549: Overall view, by Giotto, 1303-1305, 14th century (fresco), Giotto (Giotto di Bondone) (c.1266-1337) / Bridgeman Images

DSP3250096: Dunluce Castle, Co Antrim, Ireland (photo) / Bridgeman Images

DNA3798233: Interior of the nave of the Patriarchate of Pec (photo) / Bridgeman Images

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

GNG5257109: Guedelon medieval castle building, Saint Amand, France / Bridgeman Images