Oviedo, Spain. 24th March, 2018. UNESCO World Heritage Site, Oviedo Cathedral of San Salvador, before the lights were turned off during the Earth Hour 2018 environmental campaing on March 24, 2018 in Oviedo, Spain. This is an annual light-off enronmental event organised by the WWF (World Wide Fund for NAture) o raise awareness of climate change. ©David Gato/Alamy Live News

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