Or do you mean physical/geological/natural structures? There's a bunch of these, the bulk of which eventually get reasonable explanations. https://en.wikipedi

Or do you mean physical/geological/natural structures? There's a bunch of these, the bulk of which eventually get reasonable explanations. https://en.wikipedia.org/wiki/Bimini_Road https://en.wikipedia.org/wiki/Bimini_Road I'm surprised there's no Wikipedia list of these.