At present, there exists only one place to gaze through old Perplex City stuff. That is at The Official Perplex City Wayback Machine.
And, by the way, if you want to link to any sentinel articles pertaining to season 1, you will need to prepend the link with:
Other past mirrors have existed. You may still spot links to them around the wiki. You will quickly notice those links don't work, and you should probably make an attempt to correct them when noticed.