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Young alpine marmot (© Jonas Fichtner-Pflaum/Getty Images)

Königstein Fortress, Saxon Switzerland, Germany (© Bildagentur-online/Exss/Alamy)

Plains zebras at sunrise, Mokala National Park, South Africa (© EcoPrint/Shutterstock)

Roland's Breach, Ordesa y Monte Perdido National Park, Spain (© Inaki Relanzon/Nature Picture Library/Alamy Stock Photo)

Prioro, Castile and León, Spain (© Ruben Earth/Getty Images)

Zoroaster Temple, Grand Canyon National Park, Arizona, USA (© Nick Lake/Tandem Stills + Motion)

European beech forest in Belgium (© Philippe Moes/Minden Pictures)

Porto, Portugal (© Starcevic/Getty Images)