A world-renowned Chinese artist and government critic is celebrating his newfound freedom. Ai Weiwei has his passport back four years after it was confiscated by authorities.

Following a 71-hour closure of the roads connecting the Golden Gate Bridge with the Marina District, the Presidio Parkway opened to traffic Sunday night and will soon be transformed into the city’s newest parklands by the designers who created New York City’s elevated High Line park.

A newly restored Guardhouse Complex on Alcatraz Island was revealed on Tuesday, showing off the National Park Service's $3 million improvements.

After more than a year of work, the National Park Service on Wednesday pulled the tarps off upgrades at Alcatraz, showing off $3 million in improvements to the sally port, guardhouse, library, schoolhouse and other historic areas.

Spend a night on the Rock with volunteer photographers capturing its history and mystery.