The Chinatown centered on Grant Avenue and Stockton Street in San Francisco, California, is the oldest Chinatown in North America and the largest Chinese enclave outside Asia. It is the oldest of the four notable Chinatowns in the city. Since its establishment in 1848, it has been highly important and influential in the history and culture of ethnic Chinese immigrants in North America. Chinatown is an enclave that continues to retain its own customs, languages, places of worship, social clubs, and identity. There are two hospitals, numerous parks and squares, a post office, and other infrastructure. While recent immigrants and the elderly choose to live here because of the availability of affordable housing and their familiarity with the culture, the place is also a major tourist attraction, drawing more visitors annually than the Golden Gate Bridge.