Alcatraz, known as the Rock, was once among America’s most fearsome prisons, cut off from the free world on a windswept island in San Francisco Bay. Today it is a national park, visited by 1.4m tourists a year, who amble around the famous cellblocks and take selfies against the bars. Until October, if they venture to a derelict building on the island’s north side, they will also encounter giant images of serving and former prisoners.

Piano chords broke through the roaring wind at Fort Point in San Francisco on Friday as Karl Reichstetter performed a spur-of-the-moment rooftop rendition of Rihanna’s “Stay” for an audience of two.

You've seen pianos nestled in the flora at the San Francisco Botanical Garden, providing unassuming stages to any talented (or amateur) passerby. Now you can find them tucked away somewhere even more unusual: underneath the Golden Gate Bridge.

“Slow it, spread it, sink it.” It’s the guiding concept for the restoration of Roy’s Redwoods Open Space Preserve, a project underway by the county with help from One Tam.

What changes do you want to see to Crissy Field? The National Park Service, Golden Gate National Parks Conservancy, and Presidio Trust want to know.