Probably a crushing danger warning. Rock formations near the sea are very exposed to erosion and there are lots of warnings in the rock walls in Portugal because there have been a number of deaths before.

spookex

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Can confirm, used to vacation with my family there for few years in a row and I think that I might have been inside this actual cave

ranoss

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Reminds me of Porco Rosso

kurosawaa

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That was my first thought as well.

xc2215x

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That is a cool cave for sure.

negativenull

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Edmond Dantès found a lot of treasure there.

joseandres42

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I was there a couple weeks ago! Very beautiful indeed :)

vd1n

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I'd rather look at a trillion dollar company building.