Barcelona is the cosmopolitan capital of Spain’s Catalonia region, situated on the Mediterranean sea with a hilly backdrop that provides a pleasant microclimate in winter. Barcelona is known for the many astonishing modernist architectural works of Antoni Gaudí, including the basilica Sagrada Família, Park Güell and Casa Battló. The remains of the Roman city are still visible in several places. Barcelona is one of the world’s leading tourist, economic, trade fair and cultural centers, with an international airport that handles more than 40 million passengers per year, and a high-speed rail line with a link to France and the rest of Europe.