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Looking across the calm waters of Havana Bay to Havana with the 16th century fortress, Morro Castle, standing guard, Havana, Cuba, West Indies, Caribbean, Central America

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Illuminated Prague Castle and St. Vitus Cathedral seen from the banks of Vltava River, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe

Prague skyline at night with Charles Bridge, River Vltava, Prague Castle and St. Vitus Cathedral, UNESCO World Heritage Site, Prague, Czech Republic, Europe

Views of the city from Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe

Elevated view from the Southern Garden at Prague Castle over the Old Town, UNESCO World Heritage Site, Prague, Czech Republic (Czechia), Europe

Baroque Waldstein Gardens and Prague Castle through spring blossom, Lesser Town (Mala Strana), Prague, Czechia, Europe

Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

View from Moenchsberg Hill across Salzach River with Cathedral, Collegiate Church and Fortress Hohensalzburg, Salzburg, Austria, Europe

View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at sunset, London, England, United Kingdom, Europe

View of Tower Bridge and the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

View of the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at sunset, London, England, United Kingdom, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Illuminated Prague Castle and St. Vitus Cathedral at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe

View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

Cannon, Lincoln Castle, historic home of Magna Carta, Cathedral Quarter, City of Lincoln, Lincolnshire, England, United Kingdom, Europe

Grand Master's Palace, City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese, Greek Islands, Greece, Europe

View of the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

Fortress and the Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Tourist on Dubrovnik City Walls, with Fort Lovrijenac (St. Lawrence Fortress) in the background, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Tourist admiring the view from Kamerlengo Fortress over Trogir waterfront, Trogir, UNESCO World Heritage Site, Dalmatian Coast, Adriatic, Croatia, Europe

Garden of the Alcazar de los Reyes Cristianos, UNESCO World Heritage Site, Cordoba, Andalusia, Spain, Europe

Fortress and the Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

The ancient fortified city of Carcassone, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Fortress and the Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Aerial image of the Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

El Morro Fortress (Castillo de los Tres Reyes Magos del Morro) built in 1589, a picturesque fortress guarding the entrance to Havana Bay, Havana, Cuba, West Indies, Central America

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Yachts in the Borgo Marinaro and Castel dell Ovo fortress, Chiaia, City of Naples, Campania, Italy, Europe

Fortress, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Pavement cafes in the main square overlooked by the ancient fortress, in the medieval city of Hvar, island of Hvar, Dalmatia, Croatia, Europe

Illuminated tower of the Alcazar de los Reyes Cristianos at dusk, UNESCO World Heritage Site, Cordoba, Andalusia, Spain, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

View of Malaga Cathedral from the Moorish castle fortress on Mount Gibralfaro, Malaga, Costa del Sol, Andalusia, Spain, Europe