Park Güell

This is listed as UNESCO World Heritage, together with another six works by Antoni Gaudí.  

It was conceived as a residential town, inspired by English garden cities, although the houses were never built and it ended up as a public park.It is considered one of the world’s most important art nouveau creations, displaying Gaudí’s full artistic powers as he gave form to his architectural genius, putting into practice many of his innovative structural solutions. It was built on the Montaña Pelada, a concave terrain shaped like an amphitheatre, with views of Barcelona and the sea. Of the initially planned development, only two houses were built, one of which is the current Gaudí House Museum and the other is the Trias House.