Gaudi’s Park Güell is one of the top sights in Barcelona, which means loads of tourists. It was built by industry mogul Güell, who hired Gaudi to design it. Original there should have been 60 houses, but the project was never completed. Today, there are only a few houses, 86 columns, some cave corridors, and of course the famous bench made of mosaic. Entrance tickets need to be bought (do it online to skip the queue) to get access to the rather small section of Gaudi's wicked constructions, but the rest of the park can be visited free of charge. Gaudi's work in Barcelona is enlisted as a UNESCO World Heritage Site.