Panoramic Maps, also known as "Bird's Eye View", aerial view, or perspective maps. These were a popular form of art at the turn of the 20th century depicting a city's key points of interest.
Unlike traditional "maps", Panoramic maps often highlighted the commercial aspects of a town, while also clearly showing many local residences.
I've had a lot fun looking up places I've been to on these maps -- and I've gotta say - It's amazing just how much things change -- and also how much things stay the same.