England, Lancashire, Liverpool, Royal Albert Dock, The Pump House which is a former hydraulic pumping station, now a restored traditional British pub.

England, Lancashire, Liverpool, Royal Albert Dock, general vista with the Pump House tower and the Three Graces in the background.

Spain, Castile and Leon, Avila, City walls that were built from 1090 onwards and are among the best-preserved and most complete in Europe, viewed from the walkway along the interior perimeter of the w...

Spain, Castile and Leon, Salamanca, Spain, Castile and Leon, Salamanca, Spain, Castile and Leon, Salamanca, Casa de las Conchas or House of the Shells, built from 1493 to 1517 by Rodrigo Arias de Mald...

Spain, Castile and Leon, Salamanca, Spain, Castile and Leon, Salamanca, Spain, Castile and Leon, Salamanca, Casa de las Conchas or House of the Shells, built from 1493 to 1517 by Rodrigo Arias de Mald...

Spain, Castile and Leon, Salamanca, the monument to Spanish music theorist and organist Francisco de Salinas with La Clerecía Church and Casa de las Conchas behind.

Spain, Castile and Leon, Salamanca, the monument to Spanish music theorist and organist Francisco de Salinas with La Clerecía Church and Casa de las Conchas behind.

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.

Austria, Tyrol, Innsbruck, Altstadt, Stadtturm or City Tower built between 1442 and 1450 as an observation point for sentries and which was part of the City Hall.