The techniques of sparkling winemaking did not originate with the Benedictine monk Dom Pérignon, nor was the first purposely sparkling wine produced in the region of Champagne. Regardless, through centuries of refinement Champagne has become the world’s leading sparkling wine and the vinous embodiment of luxury and celebration.
get on wine search dot com and you will get the answer
If you're just wondering about current releases and ignore the auction market, I'm pretty sure Krug's Clos d'Ambonnay is the most expensive.
Hi Afshin, this is an interesting question. You might get a better response if you post it in the discussion forums since more people will see it there.