The Knights Templar have it in their impregnable fortress on the coast of France, along with pieces of the One True Cross, the Ark of the Covenant, and the ovaries of Mary Magdalene.
and JFK's brain.
Not Mary Magdalene's ovaries, her skull. The teeth match marks on Christ's body imprinted on the Shroud of Turin.
The Knights keep it in Scotland, actually.
Keep up, now.
Actually, Wilkes' mummy was on the plane that supposedly hit the World Trade Center. Since the plane didn't actually hit the tower it is in hiding with the passengers of the flight. They're all in VP Cheney's bunker waiting for the PNAC to finish taking over the world and Halliburton rounding up all the DUmmies into concentration camps and...yada yada yada...
Everyone knows that the impregnable fortress of the Knights Templar is in Scotland. They've proven the Ark of the Covenent was a gigantic storage battery.