Spain, Castile and Leon, Avila, Avila Cathedral, statue of Santa Teresa de Avila.

Spain, Castile and Leon, Avila, Avila Cathedral tower viewed from the walkway along the interior perimeter of the city walls that were built from 1090 onwards and are among the best-preserved and most...

Spain, Castile and Leon, Avila, Puerta del Alcazar or Gate of the Fortress is a monumental gate with very strong turrets flanking the entrance, it is part of the city walls that were built from 1090 o...

Spain, Castile and Leon, Avila, Puerta del Alcazar or Gate of the Fortress is a monumental gate with very strong turrets flanking the entrance, it is part of the city walls that were built from 1090 o...

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.

Republic of Ireland, County Clare, Bunratty Castle, a large 15th-century tower house built by the MacNamara family around 1425.

Ireland, County Kerry, Killarney, Ross Castle, 15th-century tower house and keep on the edge of Lough Leane in Killarney National Park, the ancestral home of the Clan O'Donoghue.

Ireland, County Kerry, Killarney, Ross Castle, 15th-century tower house and keep on the edge of Lough Leane in Killarney National Park, the ancestral home of the Clan O'Donoghue.

Spain, Castile, Segovia, Iglesia de la Vera Cruz or Church of the True Cross (1208) located below the Alcazar.

Spain, Castile, Segovia, Monasterio de Santa María del Parral, founded by King Henry IV of Castile in the 1450's, cloister with the Alcazar in the background .

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...