For a few decades, this part of lower Manhattan held something almost impossible to picture now: the largest Jewish community on earth packed into just a few crowded blocks. Newspapers, theaters, synagogues, factories, family shops, whole lives built in Yiddish and then, within one generation, much of it was pushed out, priced out, or quietly erased beneath a newer version of the city. What disappeared here was not just a neighborhood, but an entire world that once felt permanent.