Vienna's forests make a visual impact on the city's scenery -- being a source of life and sanctuary at the same time: They are omnipresent and an enormous asset, taken for granted by many. Perhaps no other European capital boasts so many acres of forest per inhabitant. There are the well-known Vienna woods in the west and north, the national park of the Danube wetlands to the east, and numerous groves and green corridors right amidst built-up urban space.