TRK1018145: Tower of the Cathedral of Saint Martin. 14th century. Utrecht. / Bridgeman Images

LLM5996849: Church of St Mary the Virgin, Iffley, Oxfordshire (b/w photo), English Photographer, (20th century) / Bridgeman Images

LLM5996859: Church of St Mary the Virgin, Iffley, Oxfordshire (b/w photo), English Photographer, (20th century) / Bridgeman Images

TRK1152116: Rome. Basilica of Saint Sabina. Exterior. / Bridgeman Images

TRK697555: Italy. Cremona. Bell tower of the Cremona Cathedral, known commonly by Torrazzo. 13th century. Lombardy. / Bridgeman Images

SGM489777: Bern, Switzerland (photo) / Bridgeman Images

BAT499407: The Baptistery, Florence, Italy (photo) / Bridgeman Images

HGP407755: Hall i' th' wood, Bolton, Lancashire (photo) / Bridgeman Images

KW379028: Monastery of Santa Maria da Vitoria (photo) / Bridgeman Images

KW379029: Monastery of Santa Maria da Vitoria (photo) / Bridgeman Images

NUM363024: Detail of chestnut tiling, Abbey of Our Lady (photo) / Bridgeman Images

NUM363026: Chestnut tiling, Abbey of Our Lady (photo) / Bridgeman Images

HGP362721: Bamburgh Castle, Northumberland (photo) / Bridgeman Images

JB24666: Exterior view of the keep, Raglan Castle, Monmouthshire, South Wales (photo) / Bridgeman Images

TRK879559: Italy. Milan. Cathedral. Gothic. 14th century. statues of the pinnacles. / Bridgeman Images

HGP873015: Galilee Porch and West Tower of Ely Cathedral, Ely, UK (photo) / Bridgeman Images

SLC878034: Stained glass in the Chapter House at Salisbury Cathedral (photo) / Bridgeman Images

SLC878036: Summer at Salisbury Cathedral (photo) / Bridgeman Images

UTD2890761: The medieval castle ruin Greifenstein castle near Bad Blankenburg, Germany 1930s (b/w photo) / Bridgeman Images

SRB5056365: Background buildings Louve, Sac and Brouette, Grand Place, Brussels, Belgium (photo) / Bridgeman Images

SRB5056370: Background buildings Louve, Sac and Brouette, Grand Place, Brussels, Belgium (photo) / Bridgeman Images

SRB5056493: Ornaments statues of Maison du Roi or the King's House Palace on the Grand Place in Brussels, Belgium (photo) / Bridgeman Images

DSP3592037: La Roche-en-Ardenne, Ardennes, Belgium (photo) / Bridgeman Images

TMA3262874: The Old Hag's Cell', Manisternagalliaghduff or 'Old Abbey', Shanagolden, County Limerick, Ireland (b/w photo) / Bridgeman Images

DSP3249938: Christ Church Cathedral, Dublin, Co Dublin, Ireland; Medieval Cathedral (photo) / Bridgeman Images

HRP2625058: Interior, Byward Tower, Tower of London, UK (photo) / Bridgeman Images

HGP2629370: Fountains Abbey, near Ripon, Yorkshire (photo) / Bridgeman Images

HGP2629394: Transepts, choir and cloisters of Rievaulx Abbey, Rye Valley, Ryedale, Yorkshire (photo) / Bridgeman Images

UTD2842042: The castle of Nuremberg / Bridgeman Images

UTD2840047: Olpe II / Bridgeman Images

UTD2840055: Soest, Osthofener Tor / Bridgeman Images

UTD2874752: View to Burgtor gate at Rothenburg ob der Tauber, Germany 1930s (b/w photo) / Bridgeman Images

GRL6372648: Genoa, Duomo (St Lawrence Cathedral), the north side, portal of St John the Baptist (first half XII century): right corbel / Bridgeman Images

GRL6372628: Genoa, Duomo (St Lawrence Cathedral), South side, the doorway of St Gotthard (1155 - 1160): right clustered column and jams, by “First Master” and “First Helper”, “Second Master” and “Second Helper” and “Third Helper” of the doorway of St Gotthard / Bridgeman Images

UTD2875563: Entrance to Giebichenstein castle near Halle, Germany 1930s (b/w photo) / Bridgeman Images

UTD2875565: Giebichenstein castle near Halle, Germany 1930s (b/w photo) / Bridgeman Images