Then you get to see Allagash's barrels, which is definitely a unique experience and makes the (FREE!!) tour worth it even if there weren't any samples. They barrel-age a lot of beers, and the giant barrels are being used to age Allagash's coolship beers. Coolships (koelschips in Dutch) are huge open-air vats used for spontaneous fermentation of sour beers. This is not really a thing in the US... they're huge in Belgian lambic production.