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Calder Mercury Fountain - Fundacio Joan Miro, Barcelona, Spain

Mercury is a toxic substance, but was mined for many years in Almaden, Spain for more than two millennia. Spain decided to dedicate a monument to the many mine workers who died from mercury poisoning. The beautiful, but deadly, fountain was built by sculptor Alexander Calder and instead of water, the fountain pumps only pure mercury. So beautiful to see, but deadly to touch.