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.

Ireland, County Carlow, Carlow Castle one of the most important Anglo-Norman castles in Ireland thought to have been built by William de Marshal between 1207 and 1213).

Ireland, County Roscommon, Roscommon town, Roscommon Castle built by Robert D'Ufford in 1269 and having changed hands frequently it burnt down in 1690 and fell into decay.

Republic of Ireland, County Wexford, Gothic Revival Johnstown Castle with a fountain in the foreground.

Republic of Ireland, County Wexford, Gothic Revival Johnstown Castle.

England, London, Tower of London, White Tower from outside the walls.

England, London, Tower Bridge, The West Gate and west wing of the building.

England, London, The Tower of London and River Thames seen from the viewing deck on the Shard known as the View from the Shard.

Israel, Jerusalem, The Dormition Abbey was built by Benedictine monks on the site of an earlier Byzantine church called Hagia Sion, constructed in the early 5th Century A.D. and destroyed in 612 A.D....

Ireland, County Clare, Quin, Knappogue Castle seen from the walled Rose Garden.