If you look at a map of Terrassa, a medium-sized city about 20 miles from Barcelona in the Catalonia region of Spain, you’ll see a jagged green gash, about two miles long, running down the middle of the city. Until recently, this was a dark, imposing ravine that, despite cliffs studded with a historic castle, an ancient church and 19th-century brick mill buildings, was a place where few locals -- much less outsiders -- ventured. “It was a dirty, dangerous place where people were scared to walk,” a local taxi driver told me.
Today the ravine is a verdant canyon filled with walkways, bridges, small restaurants, playgrounds, lawns, trees and a pool at one end that you could practically float an aircraft carrier in. Parc de Vallparadis is clearly a well-loved and well-used space. Even on a late summer afternoon in the middle of a heat wave, it was filled with people. “My husband and I go there all the time,” said my taxi driver. “It’s the lungs of the city.”