Photographs show different viewpoints, dates and conditions. They do not establish current access to a particular route. Every image is credited below.
Teotihuacan's planning is easier to appreciate through movement than through a single view. The spaces between its great monuments give the complex its rhythm. Look for the relationship between public scale and smaller surviving details, then use interpretation to imagine how those spaces were experienced. The long approach is part of the architecture.
Build the day around the open site and a manageable amount of walking. Confirm which areas are accessible rather than assuming all structures can be climbed.