Sometimes known to non-Hungarians as the Kopania Mine or the Kopania Mine, the Kopania vault is an extensive network of subterranean spaces in the 10th district of Budapest, Hungary; Considered the largest cellar complex in the country, the complex began as an underground limestone quarry in the grape-growing region of present-day Copania in the Middle Ages; When you visit Budapest, you can pass by it to get to know it closely with your family.