Spain, Catalunya, Barcelona, Montjuic, A side turret of the Palau Nacional which was built for the 1929 International Exhibition in Barcelona and now houses the National Art Museum of Catalonia.

Spain, Catalunya, Barcelona, Montjuic, View through pillars of a side turret of the Palau Nacional which was built for the 1929 International Exhibition in Barcelona and now houses the National Art M...

Egypt, Alexandria, Citadel of Qaitbay, also known as Fort of Qaitbay.

Egypt, Alexandria, Citadel of Qaitbay, also known as Fort of Qaitbay.

England, London, The Shard viewed from Tower of London.

England, London, Tower Bridge with the Olympic rings celebrating the 2012 games.

England, London, Tower Bridge, with the Olympic rings celebrating the 2012 Olympic Games.

France, Bretagne, Ille-et-Vilaine, Fougeres. defensive walls and turrets of the chateau dating from 11th to 15th century.

Poland, Krakow, turrets of the Barbican fortress with St Florian's gate in the background left.

Château de Pierrefonds dating from the 14th century. Restored by Viollet-le-Duc from 1857 on the orders of Napoleon III. Turrets and crenellated walls. Used in BBC programme as set location for Merlin...

Château de Pierrefonds dating form the 14th century. Restored by Viollet-le-Duc from 1857 on the orders of Napoleon III. Turrets and crenellated walls seen above trees. Used as location set for BBC pr...

Chateau Peyrepertuse. Ruined medieval Cathar castle stronghold lower section seen from upper castle. Fortified walls and turrets along crest of hill.