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Harpea's Cave, Navarra, Spain, if you can't figure out the anticline here maybe geology isn't for you....

Beautiful Moon view...Actually this holes are called "Eyes of God". They are in cave Prohodna in Bulgaria.

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Isle of Staffa

Fingal's Cave, An Uaimh Bhinn, Cave of Melody -- Scotland

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Quinta da Regaleira, Sintra

The Iniciatic Well, Entering the Path of Knowledge - Regaleira Estate, Sintra, Portugal