Spain, Castile and Leon, Avila, City walls with the circular Avila Cathedral built into the walls that were built from 1090 onwards and are among the best-preserved and most complete in Europe.

Spain, Castile and Leon, Salamanca, Old Cathedral or Cathedral of Santa María, Main Chapel with the glowing ornate altarpiece by the Delli brothers Nicolo and Dello.

Spain, Castile, Segovia, Iglesia de San Millan dating from the 12th century.

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with an angular view of the 15th century Tower of John 2nd of Castile from the inner courtyard.

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with a view of some of the turrets on the 15th century Tower of John 2nd of Castile seen from the Plaza de la Reina Victoria in front...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, close up view from the right on the Plaza de la Reina Victo...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, view from the right on the Plaza de la Reina Victoria in fr...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, angular view from the left on the Plaza de la Reina Victori...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, view from the left of the Plaza de la Reina Victoria in fro...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, head on view from the Plaza de la Reina Victoria in front o...

Spain, Castile and Leon, Segovia, 12th century Alcazar of Segovia with the 15th century Tower of John 2nd of Castile being the main feature, head on view from the Plaza de la Reina Victoria in front o...

Ireland, County Roscommon, Boyle, The Cloister of Boyle Abbey which was founded in 1161 by Cistercian monks.