Not all postcards have to be about urban settings and political unrest. This one is most postcard-like than others, in fact.
What you see is not just a mountain but actually a former coral reef. No wonder that the ancients venerated the mountains as emblems of Divinity, so integrated they are with everything natural, like cloud formation and rain.
But also beyond what they could understand back then: like geology and paleo-ecology.
This is what María Isabel Millán has discovered in this iconic Basque mountain: that the coral reef on top of it shows sings of sudden collapse at the OAE1a event because of acidification caused by excess of CO2. Just as is happening today.
More at Science Daily.