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The Guinness Open Gate Brewery is on the site of the historic Calvert distillery in Baltimore County, 10 miles from downtown Baltimore and 30 miles northeast of Washington DC.
The distillery, originally called the Maryland Distilling Company, was the first opened after prohibition in Maryland, in 1933. For decades it distilled, barrel-aged and bottled several spirits brands, notably the Lord Calvert Whisky brand. In 2001 the site was acquired by Diageo as part of the purchase of Seagram, and spirits aging and bottling continued at scale until 2015 (and actually continues to this day as a live production site).