"Monty Python and the Holy Grail" hit the theaters in 1975. The sophomores in my world history class were born 20 years later. And yet, when I show a photo of this symbol of power of the Holy Roman Emperor in my history class, someone inevitably says, "That's the Holy Hand Grenade," which is what it was called in the Monty Python movie.This "Holy Hand Grenade" isn't unique - many royals had one in their possession. But this golden treasure can be seen with other spectucular crown jewels of a long-dead empire in Vienna, Austria.