Városliget (City Park) is a public park in Budapest close to the city centre. Its main entrance is Heroes' Square (Hősök tere), one of Hungary's World Heritage sites. The area was formerly called Ökör-dűlő, meaning "Oxmeadow". The first mention of the name comes from 1241 in the archaic form, Ukurföld. In the 18th century the area was called Ochsenried in German. Around 1800 the official name was changed to Batthyány-erdő (Batthyány Forest) after its tenants, the Batthyány family. The first trees and planified walkways were established in 1751 and after the public park was created in the first decades of the 19th century the present-day name, Városliget was accepted and it became the first public park in the world. City Park was the main venue of the 1896 millennium celebrations of Hungary, by which time Andrássy Avenue, Millennium Underground and the Grand Boulevard were built.