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From Mathbeat Industries:
See the city that could have been. Museum of the Phantom City lets you view visionary designs created by architects and artists throughout history. Walk through the city and see Buckminster Fullers Dome over midtown Manhattan, Adolf Looss unbuilt Chicago Tribune Tower, or Archigrams pop-futurist Walking City, all while standing on the projects intended sites. To use: White bursts overlaid on a darkened map of the city indicate the sites of past visions. Tap on the burst to unlock the content for that site. Users can rate the futures, and access other features, by tapping at the bottom of the screen.
The latest version covers three cities: New York, Chicago, and San Francisco. Version 1.3 incorporates content from Unbuilt San Francisco, an exhibition co-sponsored by the AIA San Francisco / Center for Architecture and Design, California Historical Society, UC Berkeley Environmental Design Archives, SF Public Library, and SPUR.