Check out this swell video from the Exploratorium's Science in the City series which tells the story of Sutro Tower, which went "from eyesore to icon." Its years of use as the Bay Area's main antenna for local television only lasted about 30 years, starting with its completion in 1973, and there are still many who remember Twin Peaks without it. And did you know there's a tiny elevator that can take you right up to the top, 750 feet above the tallest point in the city? [Exploratorium]