Three very different proposals were presented Monday for one of the most potentially memorable sites in San Francisco - 8 acres facing the marsh at Crissy Field, downhill from the Presidio's Main Post.

When the world thinks of the San Francisco Bay Area, we see a place of natural and iconic beauty. Among San Francisco's many breathtaking spots, we appreciate the Presidio, Crissy Field, Alcatraz and the Golden Gate. The San Francisco Bay may very well be the jewel in this crowded crown. But rarely do we acknowledge the visionaries behind these beauties. On Oct. 1, we have the opportunity to do just this -- with Greg Moore and the Golden Gate National Parks Conservancy.

From post to prison to protest site to park, the island of Alcatraz has worn many hats.

Every autumn, the sky above the Marin Headlands just north of San Francisco becomes a raptor superhighway. Stand on Hawk Hill during the southward migration’s peak—from September 10 to October 10—and you can expect to see from dozens to hundreds of birds of prey in an hour.