Gaudí's magic suburb - with UNESCO World Heritage status
The Park Güell was commissioned by a wealthy patron who was inspired by English garden cities. If he was expecting something like the leafy streets of Welwyn then he shouldn't have hired Gaudí as architect.
The fantastical result includes Hansel-and-Gretel gatehouses, a magnificent staircase guarded by a mosaic lizard and the pillared Sala Hipóstila inspired by ancient Egypt. Commercially it was a failure but artistically it is a triumph, with UNESCO World Heritage status.