City of Ottawa, Canada with views of principal business buildings. Fascinating detail. a bird's-eye view, not to scale.
On a broader scale, the Historical Topographic Map Digitization project digitizing and georeferencing early-to-mid 20th century historical topographic maps covering the province of Ontario at the scales of 1:25,000 and 1:63,360.
via tweets from David Reevely and Jane MacNamara.