Vilnius is classified as a Gamma global city according to GaWC studies, and is known for the architecture in its Old Town, declared a UNESCO World Heritage Site in 1994. Before World War II, Vilnius was one of the largest Jewish centres in Europe. Its Jewish influence has led to its nickname "the Jerusalem of Lithuania". Napoleon called it "the Jerusalem of the North" as he was passing through in 1812. In 2009, Vilnius was the European Capital of Culture, together with Linz, Austria. In 2021, Vilnius was named among top-25 fDi's Global Cities of the Future – one of the most forward-thinking cities with the greatest potential in the World.