Firefighters said they were making major progress against a wildfire that roared across brush-covered hills in the city's sprawling Griffith Park on Tuesday, triggering evacuations of homes and some of the city's most famous landmarks. A wall of flames raced across ridges and jumped fire lines late in the evening as the fire drew closer to homes and the Griffith Observatory. Hundreds of firefighters and five water-dropping helicopters rushed to the landmark park — a mix of wilderness, cultural venues, horse and hiking trails and recreational facilities set on more than 4,000 acres on the hills between Hollywood and the San Fernando Valley. Interim Fire Chief Douglas L. Barry said late Tuesday that fire had "laid down" and that authorities hoped an aggressive attack in the morning would bring it under control sometime Wednesday.