Above: Photographs of porches surrounding Baltimore's city center.
If you travel through any city in United States and Canada built before 1900, you will see an interesting pattern: downtown areas with industrial buildings, commerce, and townhouses are usually surrounded by a ring of porched houses. This map illustrates this nineteenth century urban expansion pattern that have been imprinted onto urban landscape
Why Baltimore? Because of its size and layout, it is quite easy to see and document this phenomenon, but it is apparent in most major cities.