Dubrovnik is a location in 80 Days. It is an independent city-state lying on the Adriatic Sea. Dubrovnik's independence is a result of its inability to be conquered by any outside force, a feat possible thanks to what the locals refer to as 'the glass'. This glass, housed inside Sponza Palace, is a famous legend in the country, although Passepartout believes that few residents have actually ever seen it themselves.