Yes, it's a very elaborate ad for AC/DC's Iron Man 2 soundtrack, but this video in which the Great Keep of England's Rochester Castle is the backdrop for a display of architectural projection mapping is totally wicked.

At the behest of Sony Music, a company called Seeper utilized "the site of a thousand years of violent history" as the canvas for this deftly animated spot. While I'm not sure it makes me want to buy the IM2 soundtrack, I definitely want to see if Seeper does kids' birthday parties.

(Via William Gibson's Twitter page)