If cities of the future will increasingly be shaped by networked technologies, this mapping-based research and design project – set in Detroit, MI – explores how inequitable access to the Internet could yield alternate patterns of urban development. Detroit has the lowest rate of Internet connectivity in the United States, excluding thousands of people (especially school-aged youths) from the opportunities for education, employment, and belonging afforded to those with the ability to get online. Online/On-site combines publicly available spatial data with information gathered from interviews of local high school students in order to map detailed geographies of digital access and exclusion across Detroit. The project identifies latent opportunities to reimagine the city’s disinvested neighborhoods in ways that enable public assembly and digital interaction, proposing urban design scenarios that are rich with innovative ways to connect physically and virtually.