Stepping into Park Guell is like stepping into a strange but beautiful alternate dimension. Undoubtedly among the top 10 sights to visit in Barcelona, the park was designed by the city's signature architect, Antoni Gaudi. Count Eusebi Güell, Gaudí's most important patron, commissioned the park as a segregated community of small houses for wealthy people - a commune of sorts - but the project failed and the city of Barcelona bought the partially completed experiment in 1922 for use as a public park.