This is probably more of a general architectural tour to get a sense for Baltimore. I just finished reading the Baltimore Rowhome book already mentioned.

I’d start by explore the areas around the harbor. Especially Fed and Fells for some of the oldest homes. They were generally built to be working class. So smaller, narrow or setup for a business downstairs and housing upstairs.

And then venture your way North into Midtown/Mount Vernon especially around the Washington Monument for the big grand fancy houses built not too long after Fells/Fed.

Then just generally visit areas directly bordering parks. So Patterson park. Druid Hill. Union Square. General the park front properties were the builders show pieces. Venturing off the main streets you should see scaled down versions of the premium houses. So 2 story instead of 3. Narrower. Less detailing etc.

As you venture further and further from the harbor, home will be newer and general styles will change as preferences changed overtime. So you’ll see wider shorter rowhomes, or fully detached homes. That look a bit more suburban.

Obviously this is all massive generalization of the architectural identity of the city. But it hopeful could be a good starting point.