1176-1215 - The round Norman Keep (Round Tower) in Windsor Castle with the Queen's flag (Royal Standard) flying, Windsor, Berkshire, England, United Kingdom, Europe
747-1580 - Swing Bridge crossing the River Tyne, 12th century Norman Castle Keep and the Lantern of the Cathedral Church of St. Nicholas, Newcastle upon Tyne, Tyne and Wear, England, United Kingdom, Europe
747-1577 - The 12th century Norman Castle Keep, and the Lantern of the Cathedral Church of St. Nicholas, Newcastle upon Tyne, Tyne and Wear, England, United Kingdom, Europe
747-1578 - The 12th century Norman Castle Keep, and the Lantern of the Cathedral Church of St. Nicholas, Newcastle upon Tyne, Tyne and Wear, England, United Kingdom, Europe
826-560 - The keep of the medieval Conwy Castle, built on the orders of Prince Edward I from 1283 to 1289, UNESCO World Heritage Site, Conwy (Conway), Wales, United Kingdom, Europe
826-559 - The keep of the medieval Conwy Castle, built on the orders of Prince Edward I from 1283 to 1289, UNESCO World Heritage Site, Conwy (Conway), Wales, United Kingdom, Europe
832-126972 - Castle of the Order of the Teutonic Knights, Tall Hermann Tower, seat of the Estonian parliament, Tallinn, formerly Reval, Estonia, Baltic States, Northern Europe
832-126970 - Castle of the Order of the Teutonic Knights, Tall Hermann Tower, seat of the Estonian parliament, Tallinn, formerly Reval, Estonia, Baltic States, Northern Europe
832-126971 - Castle of the Order of the Teutonic Knights, Tall Hermann Tower, seat of the Estonian parliament, Tallinn, formerly Reval, Estonia, Baltic States, Northern Europe
1113-75237 - Excursion Boat at Castle Oberhofen at Lake Thun, Eiger (3970 m), Moench (4107 m) and Jungfrau (4158 m) in background, Oberhofen, Bernese Oberland (highlands), Canton of Bern, Switzerland
797-8426 - England, Hampshire, Portsmouth, Portchester Castle showing the Norman 12th Century Tower and 14th Century Keep within the Roman 3rd Century Saxon Shore Fort.
797-8433 - England, Hampshire, Portsmouth, Portchester Castle showing the 12th Century Tower and 14th Century Keep built within the Roman 3rd Century Saxon Shore Fort.
698-2732 - Silhouette of Castle Stalker, a Tower House or Keep, used often as a film set, at sunset, Loch Laich, an inlet off Loch Linnhe, Port Appin, Argyll, Highlands, Scotland, United Kingdom, Europe
698-2596 - Clifford's Tower, the former Keep of York Castle, named after Roger de Clifford who was hanged there in 1322, York, Yorkshire, England, United Kingdom, Europe
770-1755 - Haut-Koenigsbourg Castle, view of the exterior wall and keep overlooking the Alsace plain, from the grand bastion, Haut Rhin, Alsace, France, Europe
770-1753 - Haut-Koenigsbourg castle, living quarters and the keep from the lower courtyard. An impressive restored medieval castle overlooking the Rhine Plain, Haut Rhin, Alsace, France, Europe
770-1754 - Haut-Koenigsbourg Castle, view of the exterior wall and keep overlooking the Alsace plain, from the grand bastion, Haut Rhin, Alsace, France, Europe
823-80 - Aerial image of Piel Castle (Fouldry Castle) (Fouldrey Castle), a concentric medieval fortification with a keep and three towers, Piel Island, Furness Peninsula, Barrow in Furness, Cumbria, England, United Kingdom, Europe