A trip back to Sheffield, Alabama, is filled with reminders that boundaries aren't just physical.

Throughout this week, CityLab is running a series on borders—both real and imagined—and what draws so many of us to places on the edge.

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  1. Transportation

    Like Uber, but for Cartographers

    Streetcred, a blockchain-powered open-source mapping startup, will pay you to map. (And then give the data away for free.)

  2. Equity

    Why Affordable Housing Isn’t More Affordable

    Local regulations—and the NIMBY sentiments behind them—are a big driver of costs of low-income housing developers. Why don’t we know exactly how much?

  3. Equity

    When a Hospital Plays Housing Developer

    A children’s hospital in Columbus, Ohio, is trying to treat a difficult patient: Its own struggling neighborhood.

  4. Passengers wait in a German subway station
    Transportation

    The Global Mass Transit Revolution

    A new report confirms that the U.S. lags behind the rest of the world in mass transit.

  5. Life

    The Parks Where Kids (and Their Parents) Walk and Read at the Same Time

    Some libraries are getting young kids reading by taking the books outside.