England, London, The White Tower, Tower of London.

China, Tibet, View of the Kings Palace hilltop ruins.

England, East Sussex, Watergate medieval gateway entrance to walled town.

England, East Sussex, Rye, Castle and Cannons viewed from Seaward lookout point.

Italy, Sicily, Castelmola Castle, A doorway in the wall

Italy, Sicily, Castelmola Castle, A doorway in the wall

Mexico, Veracruz, Baluarte de Santiago, Exterior of fort and drawbridge.

Portugal, Lisbon, Sao Jorge Castle with the Baixa district in the foreground.

Portugal, Lisbon, View across the Baixa district to Sao Jorge Castle.

Portugal, Lisbon, View across the Baixa district to Sao Jorge castle.

Portugal, Lisbon, Tower of Belem detail.