Mystical: #Dolmen de #Soto, Trigueros, Huelva, Spain, a prehistoric tomb that has now been restored. It has a chamber and a "V" passage that gets wider towards the inside. It is almost 21 m long and is oriented from east to west, so that the first rays of sun in the Equinox move along the passage and shine on the chamber for a few minutes, as part of a ritual in which it may be that the dead came to life again, thanks to the sunlight.
Dolmen de Soto. Trigueros.JPG
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Rio Tinto in Huelva, Spain ~ deep red water, highly acidic (pH 1.7-2.5), rich in heavy metals, one of most important sources of world's copper & sulfur. Origin of Columbus' 1492 expedition, Rio Tinto is still creating history. Close analog to Martian subsurface, Rio Tinto's extreme environment represents unique biological setting to explore sulfur-based life on Europa. Understanding extremophiles living here contributes to search for extraterrestrial life.