Brewery Caves in Minneapolis by University of Minnesota Twin Cities- Photo's of the Heinrich Brewery (1866-1903). The Bohemian Brewery Flats. These caves are the only surviving remnant of the once thriving Bohemian Brewery Flats of the late 1800's. All the buildings are long gone, and their foundations are buried under the River Road. So, as poor condition as the caves are in, they're the best that's left, and that's pretty neat from a historical/archeological perspective.