Mildly related: In North Philadelphia there are a few blocks known as the Logan Triangle that were abandoned once it was discovered that the topsoil was not sta

Mildly related: In North Philadelphia there are a few blocks known as the Logan Triangle that were abandoned once it was discovered that the topsoil was not stable. https://hiddencityphila.org/2022/06/in-limbo-logan-triangle-sinks-into-oblivion/ https://hiddencityphila.org/2022/06/in-limbo-logan-triangle-...