A Visit to Barcelona by Kerry Butters. Is a travel guide to visiting Barcelona, Spain. included are things like History, climate, places to visit Etc. 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. By 2015, both Prague and Milan had more international visitors. With its Rambles, Barcelona is ranked the most popular city to visit in Spain. Look out for other travel guides, from the same Author.