Boca do Inferno (Hell’s Mouth) sea cave and natural rock arch on coast of Cascais, Portugal
Sea cave at Pismo Beach with a rocky foreground at sunset, California, USA
Cave on the sea bay and turquoise water, Porto Flavia harbor, Iglesias, Sardinia, Italy
Sunbeams penetrating at Ik-Kil cenote inlet opening, Tinúm Municipality, Yucatán, Mexico
Island of Staffa with basalt columns and Fingal’s Cave, Hebrides, Highlands, Scotland, UK
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