Mission Dolores Park while splitting the Castro, Mission District, and Noe Valley en route to Cesar Chavez Street. At Cesar Chavez Street, the route continues east through Potrero Hill before abruptly directing drivers onto northbound I-280. After about of surface streets, the route travels along I-280 for the final of that freeway, exiting near Mission Bay and Oracle Park. It winds along The Embarcadero and underneath the San Francisco–Oakland Bay Bridge—once the final leg of the route before its Treasure Island terminus. At Market Street, the route crosses in front of the Ferry Building and shortly thereafter turns westward along Washington Street to enter the Financial District. Proceeding south on the often-congested Battery Street, the route crosses Market Street and enters the SoMA neighborhood on 1st Street. Turning again at Howard Street, the route passes the SFMOMA, Yerba Buena Gardens, and Moscone Center before making its final turn onto 9th Street, crossing Market once more, and returning to Civic Center Plaza. The route ends where it began, in front of City Hall, after traveling . History World's Fair attraction In the late 1930s, residents of San Francisco and the greater Bay Area celebrated the completion of both the Golden Gate Bridge and San Francisco–Oakland Bay Bridge. In July 1938, President Franklin D. Roosevelt was given a vehicular tour of the city, including its two bridges, with Senator William Gibbs McAdoo and Mayor Angelo Joseph Rossi before speaking at the Treasure Island fairgrounds, site of the Golden Gate International Exposition of 1939–40. Later that year, the San Francisco Down Town Association devised a route from behind City Hall to Treasure Island that was originally titled the "50-Mile Scenic Drive", marking the way with blue and gold triangular signs. The name was changed shortly thereafter—probably with marketing intentions—to reflect San Francisco's approximate area () and reference the California Gold Rush of 1849, from which the term "forty-niner" originates. The Down Town Association produced brochures highlighting the scenic drive for tourists. On September 14, 1938, the 49-Mile Scenic Drive was officially opened by Douglas Corrigan, who had achieved fame (and his nickname, "Wrong Way") earlier in 1938 for claiming to fly from New York City to Los Angeles but ending up in Dublin. Corrigan drove at least part of the route in reverse on that day. Reroutings and a new sign After the Golden Gate International Exposition was closed in 1940, control of