Workers will begin assembling @Large: Ai Weiwei on Alcatraz in buildings that are part of the old military and federal prison in late August. It’s a perfect venue for an artist who has riled government officials in Beijing to the point of his own imprisonment.

On September 27, @Large: Ai Weiwei on Alcatraz, a series of site-specific commissions within the historic former Alcatraz Federal Penitentiary will debut. Don’t expect to see the artist; he remains unable to travel, though his ideas will be everywhere.

The title of international art star Ai Weiwei’s installation on Alcatraz, @Large, is a contradiction, since the artist himself is anything but. The unusual exhibition on the site of the famous penitentiary opens this weekend and explores themes of freedom and imprisonment.

After being jailed by the Chinese government in 2011, and his work censored in the country, the dissident artist Ai Weiwei received his passport back this week.

Michael Krasny of KQED Forum chats with filmmaker Ken Burns and other featured speakers at "Parks For All," a conference that looked at diversity issues in the national parks, in conjunction with outreach related to Burns's upcoming documentary "The National Parks: America's Best Idea."

A Miracle of Survival! A Franciscan Manzanita--a species thought to have been extinct in the wild for almost 70 years--is rediscovered at a construction site near the Golden Gate Bridge.

The redwoods in Muir Woods provide ideal Coho Salmon habitat, providing woody debris to protect young salmon in the creeks and keeping them shaded and cool. But the Coho in Muir Woods Redwood Creek are endangered, and local biologists and volunteers are working to protect the salmon and restore their habitat.

Over a million visitors tour Alcatraz every year, but a recent discovery has revealed another attraction that lives within the shadows of this historical prison: glowing millipedes of Alcatraz.

Spotted owls are one of the most iconic threatened species in the West. But despite two decades of work to bring them back, their numbers are still declining. That may be due in part to a new threat - not from humans, but from other owls.

Spotted owls are one of the most iconic threatened species in the West. But their numbers are still declining that may be due in part to a new threat, not from humans, but from other owls.