"ASTRA" National Museum Complex is a museum complex in Sibiu, Romania, which gathers under the same authority four ethnology and civilization museums in the city, a series of laboratories for conservation and research, and a documentation center. The museum is located in the Dumbrava Forest, 3 km south of Sibiu and is easily accessible by car, bus or tramway. Occupying an area of 0.96 square kilometres, it is the largest open air museum in Romania and one of the largest in Central and Eastern Europe. It contains houses and workshops of the traditional Romanian folk culture from the pre-industrial era. Over 300 houses and other buildings are situated in the forest around two artificial lakes with over 10 km of walkways between them.