St. Mawes Castle, an artillery fort constructed by King Henry VIII near Falmouth, Cornwall, England, United Kingdom, Europe

Entrance to the Fortaleza de Sao Miguel (St. Michael Fortress) now the Museum of the Armed Forces, Luanda, Angola, Africa

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Sunset over Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Fortaleza de Sao Miguel (St. Michael Fortress), Luanda, Angola, Africa

View to St. Eustatius from Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

View to St. Eustatius from Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

View to St. Eustatius from Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Fort of San Carlos of the Cabin (Fortaleza de San Carlos de la Cabana (Fort of St. Charles), UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

St. Michael's Mount in early morning light and a falling tide, with the causeway between the island and the mainland at Marazion still largely submerged, Marazion, near Penzance, Cornwall, England, United Kingdom, Europe

St. Michael's Fortress and Sibenik Harbour, Sibenik, Dalmatian Coast, Croatia, Europe

Fort St. Louis, St. Martin, French territory, West Indies, Caribbean, Central America

St. Mary in Castro church and Roman Pharos, an ancient lighthouse, at Dover Castle, Dover, Kent, England, United Kingdom, Europe

Little fishing boat in front of Fort of San Carlos of the Cabin (Fortaleza de San Carlos de la Cabana (Fort of St. Charles), UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

St. Michael's Mount, Marazion, Cornwall, England, United Kingdom, Europe

Aerial view of St. Michael's Mount at dawn, Marazion, Cornwall, England, United Kingdom, Europe

View in the Rhodope mountains from the Church of St. Mary of Petrich, Assen fortress, Asenovgrad, Bulgaria, Europe

St. Michael's Mount, Marazion, Cornwall, England, United Kingdom, Europe

St. Michael's Mount, Marazion, Cornwall, England, United Kingdom, Europe

Church of St. Mary of Petrich, Assen fortress, Asenovgrad, Bulgaria, Europe

St. Michael's Mount, Marazion, Cornwall, England, United Kingdom, Europe

St. Michael Church and Veste Oberhaus fortress in Passau, Germany, Europe

Castillo de San Marcos, St. Augustine, oldest continuously occupied European-established settlement, Florida, United States of America, North America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Hill castle, Burg Maus Castle, St. Goarshausen-Wellmich, UNESCO World Cultural Heritage Site Upper Middle Rhine Valley, Rhein-Lahn-Kreis district, Rhineland-Palatinate, Germany, Europe

Crusader Castle of St. Hilarion, Turkish part of Cyprus

Crusader castle of St. Hilarion, Turkish part of Cyprus

View of the city of Sibenik at night from St Michael's Fortress, Sibenik, Croatia

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