For the first time in his life Rahn met someone even more obsessed with finding the Grail than he was. Indeed, so confident was Himmler of finding the Grail that he’d already prepared a castle – Wewelsburg in Westphalia – for its arrival. In the basement, surrounded by busts of prominent Nazis, was an empty plinth where the Grail would go.

Apparently advertisers who take the tour have been known to drool ovr the opportunities of putting recipes on the kitchen counter and apparel recommendations in the closet. It will come true — advertisers abhor blank space like nature abhors a vacuum.