the Marina Green parking lot and takes a path of residential streets to the Palace of Fine Arts, the most prominent remaining structure from the 1915 Panama–Pacific International Exposition. Continuing for a few blocks each on Baker, Bay, Broderick, Chestnut, and Lyon streets, the route enters the Presidio at Lombard Street. At , the route passes the Letterman Digital Arts Center, proceeds onto Presidio Boulevard, and continues onto Lincoln Boulevard. The route detours through the Presidio's Main Post before returning to Lincoln Boulevard near San Francisco National Cemetery. Passing above Crissy Field and Fort Point, under the U.S. Highway 101 (US 101) approach to the Golden Gate Bridge, and above Baker Beach, the route exits the Presidio into Sea Cliff. Continuing along El Camino del Mar into Lincoln Park, the route passes the Legion of Honor and exits the park into the Richmond District. Turning westward onto Geary Boulevard, drivers proceed several blocks and continue onto Point Lobos Avenue, soon reaching the Sutro Baths and Cliff House. At , the route proceeds due south along the city's Pacific coast on Great Highway, passing Ocean Beach, the edge of Golden Gate Park, the San Francisco Zoo, and skirting Lake Merced before returning north on Lake Merced Boulevard past San Francisco State University and continuing through the Sunset District along Sunset Boulevard. The route then enters Golden Gate Park and winds through it for about —circling Stow Lake; passing the Japanese Tea Garden, San Francisco Botanical Garden, and California Academy of Sciences; turning at the AIDS Memorial Grove; and exiting the park's East Portal at Stanyan Street. Briefly skirting the Haight-Ashbury and Cole Valley neighborhoods, the route ascends Parnassus Street and passes the University of California, San Francisco's main campus. Turning south onto 7th Avenue in the Inner Sunset, the route curves around Mount Sutro and the Laguna Honda Reservoir before turning east and climbing Twin Peaks. From Twin Peaks Boulevard, drivers are directed into the north peak's parking area and offered unobstructed views of the city below. The route then descends into Corona Heights—built to take full advantage of the views at this height. Winding its way down the hill, the route takes drivers past the Randall Museum before descending east along 14th Street into San Francisco's prominent gay neighborhood, The Castro. Now into the drive, the route turns southward along tree-lined Dolores Street, passing Mission San Francisco de Asís and