Because the sites of Roman Gaul are in large measure active, vibrant cities there is a tendency for the visible remains to be the substantial public buildings. An enormous amount of more conventional archeology also exists, but continuous habitation tends to cover up a lot of it, and to over time destroy some.
In visiting the civic edifices of Roman Gaul we shall start out small and work our way up.
This is the Odeon of Lugdunum, modern day Lyon.
Spend a few quiet minutes here. You get a very palpable sense of the past being close at hand.
For a nice graphic overview of Roman Theaters this The Theaters has been compiled by Whitman college.
Practical tips for a visit.
This is on a hill magnificently overlooking Lyon and the Rhone valley. It is a very steep climb, so take the funicular from the metro station below. You will definitely want to allow time for a visit to the Gallo-Roman museum nearby. This involves yet more climbing, as the museum has only one entry/exit point way up at the top of things. Practical shoes are a must.
Next up: sights to put a tear in the eye of a hard working archeological drudge.