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Aggstein Castle Ruin on Danube River at sunset, Cultural Landscape Wachau, UNESCO World Heritage Site, Austria, Europe

Berber granary, Agadir Tashelhit, in the form of a fortress, Anti-Atlas mountains, Morocco, North Africa, Africa

Inside walls of the Berber granary, Agadir Tashelhit, over 700 years old, Anti-Atlas mountains, Morocco, North Africa, Africa

Behind the walls of the Berber granary, Agadir Tashelhit, Anti-Atlas mountains, Morocco, North Africa, Africa

Berber granary, Agadir Tashelhit, in the form of a fortress, Anti-Atlas mountains, Morocco, North Africa, Africa

Passageway between two buildings in Taroudant, old Berber architecture, Taroudant, Morocco, North Africa, Africa

Castel Sant'Angelo (Mausoleum of Hadrian) seen from Janiculum Terrace at sunset, Rome, Lazio, Italy, Europe

Fortification on top of Puig de St. Maria, Pollenca, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Promenade view from Ovo Castle of waterfront with hotels, and marina landscape seen from Castel dell Ovo islet fortress, Naples, Campania, Italy, Europe

Ovo Castle fortifications with canons at Castel dell Ovo islet fortress and city view at the Gulf of Napoli, Naples, Campania, Italy, Europe

Promenade and city view, Villa Comunale park at the waterfront seen from Castel dell Ovo fortress at Napoli Gulf, Naples, Campania, Italy, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Panoramic view of Alhambra, UNESCO World Heritage Site, and Sierra Nevada mountains, Granada, Andalucia, Spain, Europe

View of Alhambra, UNESCO World Heritage Site, and Sierra Nevada mountains at dusk, Granada, Andalucia, Spain, Europe

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Euyrpe

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

Fortified floors and terrace view of the Torre de Belem (Belem Tower), medieval defensive tower on the bank of Tagus River, UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

View of floating bars and nightclubs on Sava River across to Victor Monument at Belgrade Fortress, Belgrade, Serbia, Europe

Great Kalemegdan staircase leading to The Victor Monument, Belgrade Fortress, Belgrade, Serbia, Europe

Fort Carre and Antibes Harbour at sunrise, Provence-Alpes-Cote d'Azur, French Riviera, France, Mediterranean, Europe

City of London skyscrapers and the Tower of London viewed across the River Thames, London, England, United Kingdom, Europe

A couple of people warm their hands with the castle in the background, Thun, Canton of Bern, Switzerland, Europe

Historical cannons at Faial fortress with the village in the background, Faial, Santana municipality, Madeira, Portugal, Atlantic, Europe

Fort Lovrijenac (St. Lawrence fortress), in summer, Dubrovnik, Dubrovnik-Neretva county, Croatia, Europe

View of the old town at sunset, with Franciscan Monastery and Fort Lovrijenac, Dubrovnik, UNESCO World Heritage Site, Dubrovnik-Neretva county, Croatia, Europe

Man with hat admiring the old town from Karmelengo castle, in summer, Trogir, Split-Dalmatia county, Croatia, Europe

Kasbah Taourirt, Ouarzazate, Road of Kasbahs, Atlas Mountains, Southern Morocco, Morocco, North Africa, Africa

Kasbah Taourirt, Ouarzazate, Road of Kasbahs, Atlas Mountains, Southern Morocco, Morocco, North Africa, Africa

Cruise ship behind Torre de Belem (Belem Tower) (Tower of St. Vincent), UNESCO World Heritage Site, Belem, Lisbon, Portugal, Europe

View over Gramvousa Bay to the island and fortress of Imeri Gramvousa, near Kissamos, Hania (Chania), Crete, Greek Islands, Greece, Europe

View across the Venetian Harbour, sunset, the Koules Fortress reflected in water, Iraklio (Heraklion), Crete, Greek Islands, Greece, Europe

The 16th century Renaissance courtyard, Wawel Castle, UNESCO World Heritage Site, Krakow, Poland, Europe

A section of the wall of the Citadel of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Rumli Hisar (Rumelian Castle) (Rumelihisari) hilltop 15th century fortress with multiple towers, walking paths and water views, Istanbul, Turkey, Europe

View of Hohensalzburg Castle from Mirabell Gardens, UNESCO World Heritage Site, Salzburg, Austria, Europe

View of Hohensalzburg Castle from Mirabell Gardens, UNESCO World Heritage Site, Salzburg, Austria, Europe

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

Wine fields by Altenburg, old fortress in Bamberg, UNESCO World Heritage Site, Bavaria, Germany, Europe

Wine fields by Altenburg, old fortress in Bamberg, UNESCO World Heritage Site, Bavaria, Germany, Europe

Boats moored in Aare River with Aarburg Castle in background, Aarburg, Canton of Aargau, Switzerland, Europe

Muness Castle, 1598, most northerly in United Kingdom, coastal views, Uyeasound, Island of Unst, Shetland Isles, Scotland, United Kingdom, Europe

St. Vitus Cathedral and Prague Castle lit up during the evening blue hour reflecting in the Vltava River, UNESCO World Heritage Site, Prague, Czech Republic, Europe

St. Vitus Cathedral and Prague Castle viewed from Charles Bridge, UNESCO World Heritage Site, Prague, Czech Republic, Europe

St. Vitus Cathedral and Prague Castle viewed from Charles Bridge during sunrise, UNESCO World Heritage Site, Prague, Czech Republic, Europe

The early morning sun lights up St. Vitus Cathedral and Prague Castle, UNESCO World Heritage Site, Prague, Czech Republic, Europe

The Medieval ruins of Tintagel Castle, allegedly the birthplace of King Arthur, on Atlantic coast cliffs at Tintagel, Cornwall, Cornwall, England, United Kingdom, Europe

Spitalbastei or Spitaltor (Spital Bastion or Gate), Rothenburg ob der Tauber, Bavaria (Bayern), Germany, Europe

Panoramic view of Portoferraio Gulf, Elba Island, from top of Monte Volterraio on which the fortress dominates north part of island, with Church of San Leonardo in the background, Tuscan Archipelago, Tuscany, Italy, Europe