Magnificent Cuevas del drach are beautiful caves in Mallorca, Spain. There are a four caves, which are connected. Their depth is of about 25 metres and they are about 4km long. I remember spending there a lot of time but I don't think I walked 4km along the tunnels. I believe, only a part is available for tourists. To me, it was an amazing experience, I've never seen a more beautiful geological formation in my life. What else can I write? Maybe only this that after the visit I was totally speechless. Great! :)
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From @kinia