DGA911554: Chapel with frescoes by Bernardino Loschi, before 1511, Palace of Pio family, Carpi, Emilia-Romagna, Italy / Bridgeman Images

UDK5430726: Europe, Spain, Northern Spain, Oviedo, Iglesia de San Miguel de Lillo, window-Photo by Dorota Jarymowicz and Mariusz Jarymowicz / Bridgeman Images

TRK831807: Slovenia. Ljubljana. Castle. Built in the 12th century. The castle's Tower dates to 1848. / Bridgeman Images

TRK831813: Slovenia. Ljubljana. Castle. Built in the 12th century. The castle's Tower dates to 1848. / Bridgeman Images

DNE6200053: The Old Steeple, Dundee (hand-coloured print), Phillips, Charles Gustav Louis (1863-1944) / Bridgeman Images

DGA914646: Entrance, L'Herm Castle (16th century), Rouffignac Saint Cernin Dereilhac, Aquitaine, France / Bridgeman Images

DGA909972: Cloister of Abbey of Most Holy Trinity, Cava dei Tirreni, Campania, Italy / Bridgeman Images

FBU4235747: Tower of the medieval ramparts of Avignon (14th century)/UNESCO class site / Bridgeman Images

DGA910084: Entrance to Bishop's Palace, Verona (UNESCO World Heritage List, 2000), Veneto, Italy / Bridgeman Images

XIR694786: Entrance to the Abbey of Mont Saint-Michel (photo), French Photographer, (20th century) / Bridgeman Images

CHT868445: Drawing for the restoration of the gargoyles of Notre Dame, 1855 (pen & ink on paper), French School, (19th century) / Bridgeman Images

IBE5342641: Castell de Cardona and Church of Sant Vicenç of Cardona, 9th century (photo) / Bridgeman Images

DGA3680963: Pallata, medieval tower of Brescia, Lombardy, Italy, woodcut from Le cento citta d'Italia (Hundred Italian towns), illustrated monthly supplement of Il Secolo, Milan, 1889 / Bridgeman Images

DGA5652979: Facade of Medieval church of Saints Niccolo and Cataldo, mix of Romanesque and Baroque styles, Lecce, Salento, Apulia, Italy, 18th century / Bridgeman Images

DGA3935964: Ruins of 15th century church, in vicinity of Westport, Croagh Patrick Mountain in background, Connemara, County Mayo, Ireland / Bridgeman Images

SAP478962: Pena National Palace, Sintra, Portugal, 2009 (photo) / Bridgeman Images

XIR243755: View of the 15th century castle and the town square (photo) / Bridgeman Images

LAF490274: The Danube at Strasbourg (w/c on paper), Peellaert, Philippe Auguste de (1793-1876) / Bridgeman Images

JFS134015: The Nave Arcade (photo) / Bridgeman Images

UIG1571317: Island Castle, Trakai, Lithuania (photo) / Bridgeman Images

LLM2793638: Carreg-Cennen, Wales (engraving), English School, (19th century) / Bridgeman Images

HGP386902: Bective Abbey (photo) / Bridgeman Images

DGA754181: Romanesque crypt in Brescia cathedral, Brescia, Italy / Bridgeman Images

GCL3392915: MOROCCO: RABAT: CHELLAH The minaret at Chellah, a medieval necropolis near Rabat, that also contains ruins of Sala Colonia, a Roman settlement. Photograph, c.1975. / Bridgeman Images

DGA625826: Entrance of Chapter House in romanesque cloister of Cathedral of Notre-Dame, Le-Puy-Notre-Dame, France / Bridgeman Images

DGA3935960: Ross Errilly Friary, also known as Ross Abbey, 14th-15th century, in vicinity of Headford, with cattle grazing, Connemara, County Galway, Ireland / Bridgeman Images

GNG5269363: Montmajour abbey in Provence : embrasure, Montmajour, France / Bridgeman Images

UIG1571390: St. Francis' and Bernadine Church, Vilnius, Lithuania (photo) / Bridgeman Images

GNG5260795: Saint Michel de Cuxa abbey cloister Cuxa France / Bridgeman Images

UIG1571320: Island Castle, Trakai, Lithuania (photo) / Bridgeman Images

KW379011: View of the castle (photo) / Bridgeman Images

JCH316166: Bodiam Castle, East Sussex (photo) / Bridgeman Images

SAP490614: Chateau de Castelnaud la Chapelle, Périgord, France (photo) / Bridgeman Images

JFS134557: The Exterior of the Apse of Pieve di Santa Maria, built in 12th century (photo) / Bridgeman Images

JB136829: North west quarter seen from the walls (photo) / Bridgeman Images

BAT614772: Romena Castle, Arezzo, Italy (photo) / Bridgeman Images