Sand dunes at the edge of the Richmond District for San Francisco's Golden Gate Park in the 1880s.
Golden Gate Park, the 1,000-acre green space south of the famous bridge that turns 80 years old this year, is located on what was once the $4 sand dune ecosystem in the western hemisphere. These dunes spanned seven miles, essentially the entire width of modern-day San Francisco.
About two square miles of dunes still exist today, but the Bay Area has evolved a great deal since then.
Take a look at the maps, paintings, and historical photographs that show the journey of San Francisco.