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La ruta de la seda: Mogao Caves on the Silk Road, Dunhuang, Gobi Desert, China.
Slovenian Caves - the Grand Canyon that is underground
Great Wall of China
Fingal's Cave. Staffa, Scotland.
Iris Cave, Monasterio de Piedra, Zaragoza, Spain!
Passageway to the sea - Isle of Crete, Greece
Menton, Provence-Alpes-Cote d'Azur, France