People sitting in a street cafe, city wall in the background, Alcudia, Majorca, Spain

High angle view of fort, Barrio de Santiago, Barrio de las Cuevas, Guadix, Granada, Andalusia, Spain

Town on hillside, Altea, Valencia, Spain

Fort Ponta da Bandeira in Lagos, Algarve, Portugal

Castle over looking town, Alcazaba, Almeria, Andalusia, Spain

Fort Ponta da Bandeira in Lagos, Algarve, Portugal

Low angle view of flag mounted in front wall of castle

Town at waterfront lit up at night, Denia (Costa Blanca), Alicante, Spain

Defensive wall on mountain range, Mutianyu, Great Wall Of China, China

Palm trees in front of castle, Jerez De La Frontera, Cadiz, Andalusia, Spain

Aerial view of tourists at town square, Ippokratous Square, Dodecanese Islands, Greece

Moorish castle, Silves, Algarve, Portugal

Fortified wall of fort, Avila, Spain