Since 1999, SkyscraperPage.com's forum has been one of the most active skyscraper enthusiast communities on the web. The global membership discusses development news and construction activity on projects from around the world, alongside discussions on urban design, architecture, transportation and many other topics. SkyscraperPage.com also features unique skyscraper diagrams, a database of construction activity, and publishes popular skyscraper posters.
I love it. San Francisco has to have one of the most interesting landscapes anywhere. I could stare at those rolling hills covered with humanity all day. And I love how the skyline is broken up into clusters, yet the density never really fades.