Yes, that Champagne.
Reims, perhaps the most famous city in the Champagne region, has two main claims to fame: the proprietary beverage which, like Bordeaux or Côtes du Rhône, according to strict regulation, can only be called champagne if produced in that region; and the cathedral, where many French kings have been crowned. The TGV books it from Gare de l'Est to downtown Reims in a scant 45 minutes for 20-30 euros round trip at the student rate, depending on how far ahead one buys the tickets. Amy and I booked less than 48 hours in advance, more or less on a whim.
Millenia of history, minutes on the TGV. Welcome to modern Europe.