A UNESCO World Heritage Site, Parc Güell began as a failed real estate project with panoramic views in the foothills of the Serra de Collserola. An entrepreneur named Güell hired Gaudí to design the grounds. Only two houses were built, neither by Gaudí though he lived in one from 1906 until the 17 hectares (42 acres) became a public park in 1926. The house today is a museum.  Between 1900 and 1914, Gaudi designed dragon fountains, rock pillars that resemble twisted tree trunks and other naturalistic elements that proceeded his work on La Sagrada Família. The park is a 20-minute walk from the Lesseps Metro stop, up a steep hill. Entrance to the park is free.