Christmas Tree Point Road and Twin Peaks, San Francisco © Terence Chang/Getty Images

Panoramic views await at the dual peaks of Noe and Eureka, which rise nearly 1,000 feet above San Francisco. Known as Twin Peaks, this landmark provides habitat for a special species--the Mission blue butterfly. Only a handful of places in the world support these endangered little blues, and all are here in the Bay Area. Most of their grassland habitat has been destroyed.