Gun Tower in Hurst Castle, Keyhaven, Hampshire, England, United Kingdom, Europe

Fishing boat, Cromwell's Castle on Tresco, Isles of Scilly, England, United Kingdom, Europe

Fishing boat, Cromwell's Castle on Tresco, Isles of Scilly, England, United Kingdom, Europe

Fishing boat, Cromwell's Castle on Tresco, Isles of Scilly, England, United Kingdom, Europe

Security guard in front of the 12th century Minaret of Jam, UNESCO World Heritage Site, Ghor (Ghur, Ghowr) Province, Afghanistan, Asia

Royal Exchange Theatre and Boer War Memorial, Exchange Street, St. Annes Square, Manchester City centre, Manchester, England, United Kingdom, Europe

Orford Castle with its unique polygonal tower keep, dating from the 12th century, Orford, Suffolk, England, United Kingdom, Europe

Ypres Tower, Rye Castle Museum, Rye, East Sussex, England, United Kingdom, Europe

Ypres Tower, built 1250, Rye, East Sussex, England, United Kingdom, Europe

Ypres Tower, built 1250, Rye, East Sussex, England, United Kingdom, Europe

Tower Bridge and cannon, London, England, United Kingdom, Europe

The Block house, a 16th century gun tower protecting Old Grimsby Harbour, Tresco, Isles of Scilly, United Kingdom, Europe

Old historic fort and colonial guardhouse with cannon pointed to the sea in the city of Salvador in Bahia, Brasil

BRD Germany Thuringen Jena City of University Green City at the River Saale Founded in the 9 Century City Founded 1236 Founder Lords of Lobdeburg Market Place Region for Wine GrowingTower of Gunpowder and Tower of New Centre

City wall with Pulverturm gun powder tower, Andernach, Rhineland-Palatinate, Germany, Europe

View through window with shutters from the Gun Hill Signal Station in Barbados, Bridgetown, Barbados, Caribbean