At least 50 blocks of housing and shopping in a historic town center that has mostly original buildings. Doesn’t really exist out of a very small subset. You could add the French quarter to that list. old town Alexandria is good too. But you need homes, shops and restaurants in buildings that are at least 150 years old.

Most other places demolished their equivalents. DC came close, but the freeway riots stopped them just in time. (The key bridge was going to be demolished for an interstate and the entire neighborhood would have become an on-ramp)