The Geekologie writer suggests that this mysterious object in the sky of a Google Street View image is the hole from which the "Four Unicornmen of the Apocalypse" will emerge. It's from outside of Porto, a
What do you think that it is?
Link via Geekologie
UPDATE: There is a city in northern Portugal called Porto and a town in western Spain called Porto. Which one is it? A ferocious debate rages in the comments.