[websterisk]

Barcelona is particularly awesome in this respect. Historically, it was a few distinct villages. Then during a period of growth each of those separate areas were connected by a modern (at least at the time) grid. Looking at this area on google maps is fun. You can scroll between two adjacent zoom levels to see modern gridded order vs the total chaos of a gothic village (looking at the gothic quarter or vila de gracia in particular).

When I visited, I was confused about how the city was configured so oddly until I saw a pre-modernization map, then everything suddenly clicked.