August 16, 2007 -- Worldwide Biggest Wine Barrel. The first "big barrel" in the cellar of Heidelberg Castle was built in 1591. Today's tourist attraction, the barrel built in 1751 is even bigger: More than nine yards long and eight yards high, it has a capacity of 55,345 gallons of wine. In former times, the wine growers had to pay their share of taxes by delivering wine to the castle.