Barcelona was the 20th-most-visited city in the world by international visitors and the fifth most visited city in Europe after London, Paris, Istanbul and Rome, with 5.5 million international visitors in 2011. With its Rambles, Barcelona is ranked the most popular city to visit in Spain.Barcelona as internationally renowned a tourist destination, with numerous recreational areas, one of the best beaches in the world, mild and warm climate, historical monuments, including eight UNESCO World Heritage Sites, 519 hotels as of March 2016 including 35 five star hotels, and developed tourist infrastructure
The Barri Gòtic (Catalan for "Gothic Quarter") is the centre of the old city of Barcelona. Many of the buildings date from medieval times, some from as far back as the Roman settlement of Barcelona. Catalan modernista architecture (related to the movement known as Art Nouveau in the rest of Europe) developed between 1885 and 1950 and left an important legacy in Barcelona. Several of these buildings are World Heritage Sites. Especially remarkable is the work of architect Antoni Gaudí, which can be seen throughout the city. His best-known work is the immense but still unfinished church of the Sagrada Família, which has been under construction since 1882 and is still financed by private donations. As of 2015, completion is planned for 2026.