View from the walls of the fortress of Ribat of Sousse at sunset, Tunisia
Looking uphill at the Great Wall of China, Mutianyu in Huairou District near Beijing, China
Walls of Punta Gallinero and Cotatuero cascade, Ordesa National Park, Pyrenees, Aragon, Spain
The Huanghuacheng (Yellow Flower City) section of the Great Wall, Huairou, Beijing, China
Old town and harbor, Revelin Fortress bridge, Dubrovnik, Croatia
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