Albania, Kruja, Exterior of stone watchtower at Kruja Castle.

England, Hampshire, Portsmouth, Portchester Castle showing the Norman 12th Century Tower and 14th Century Keep beyond bridge over the moat built within the Roman 3rd Century Saxon Shore Fort.

England, Hampshire, Portsmouth, Portchester Castle Norman 12th Century flint walls rebuilt on the site of the Roman 3rd Century Saxon Shore Fort.

England, Hampshire, Portsmouth, Portchester Castle showing the Norman 12th Century Tower within the 14th Century Keep within the Roman 3rd Century Saxon Shore Fort.

England, Hampshire, Portsmouth, Portchester Castle showing the Norman 12th Century Tower and 14th Century Keep within the Roman 3rd Century Saxon Shore Fort.

China, Yanqing County, Badaling, Tourists visiting the Great Wall.

Portugal, Estremadura, Sintra, Pena National Palace.

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

Portugal, Estremadura, Sintra, Pena National Palace.

Ireland, County Donegal, Glenveagh Castle.

Germany, Bayern, Allgau, Fussen, Schloss Neuschwanstein castle with forggensee lake in the backround. built in 1869-86 for king ludwig II.

Germany, Bayern, Schwangau, Neuschwanstein castle built 1869-86 for king ludwig ii with forggensee in background.