Tunnel Tops Park in the Presidio

There's going to be a special groundbreaking event in San Francisco today for the Presidio Tunnel Tops, an expansive park on top of the eastern tunnels of the Presidio Parkway. Cristina Rendon reports

BAY AREA PEOPLE Fort Winfield Scott

We head to the last undeveloped piece of land in SF's Presidio It's usually closed to the public, but we'll take you into some of the most reassured spots and tell you why the Presidio Trust says it's being so picky about finding a partner for the project.