Many first-time visitors gasp in awe when they see this gorgeous, white-framed glass structure, and locals will tell you that its effect isn't much dimmed over time. Built in the late 1870s, the oldest building in the park is the last remaining wood-frame Victorian conservatory in the country. It's also a copy of the conservatory in the Royal Botanical Gardens in Kew, England, with a spectacular, 14-ton glass dome atop its perch. The gardens in front of the conservatory are planted seasonally, with the flowers often fashioned like billboards depicting the Golden Gate Bridge or other city sights. On the east side of the conservatory (to the right as you face the building), cypress, pine, and redwood trees surround the Dahlia Garden, which blooms in summer and fall. To the west several hundred feet on John F. Kennedy Drive is the Rhododendron Dell. The dell contains the most varieties -- 850 in all -- of any garden in the country. It's especially beautiful in March, when many of the flowers bloom, and is a favorite spot of locals for Mother's Day picnics. Even if you don't plan to go inside, the conservatory and its gardens are well worth a gander from the outside.
This is the photograph of the front as you aproach the building from John F. Kennedy Drive. I prefer black and white photographs for architectural shots as it brings out more the architectural features of the building specially in close-up shots. The different color foliage or structures that sorround it will not draw attention from your subject if presented in black and white.
Some information where taken from fodors.com, as Fodor's consider this building as a "must see" in the City of San Francisco.