Paris, then called Lutetia (Lutetia Parisorium, Lutèce) was Roman during the 1st, 2nd and 3rd centuries.This is more or less what it is supposed to have looked like. The white-framed picture is “stolen” from an interesting site, “Paris, a Roman city”. I just added something in red.
I already made posts about the trace of a Roman aqueduct, the Roman amphitheatre and the Roman baths. There are some other traces, including a theatre, which today are hidden under a school building, Boulevard Saint Michel.
A blogger friend, “PARIS-BISE-ART”, made a post about a big stone, which seems to be what is left of the Roman “highway”, the “Cardo Maximus” (the red dotted line on the plan above) leading from the south, through Lutetia (present streets Rue Saint-Jacques, Rue du Faubourg-Saint-Jacques and Rue de la Tombe-Issoire, continuing northwards on the other Seine bank, split into Rue Saint-Martin and Rue Saint-Denis). You can find the stone just in front of the small church (possibly the oldest remaining in Paris), Saint-Julien-du-Pauvre, close to Rue Saint-Jacques. (More about this church in a previous post.)
Another discovery by “PARIS-BISE-ART” is some kind of indirect souvenir of the Philippe-Auguste wall - on which I have posted a number of times, see the most recent one. A very narrow building, at least the front of it, on Boulevard Saint-Germain, fills the empty space where the wall passed. Once more it’s astonishing to see how Google Earth helps you to see that a lot of walls of existing buildings still follow the trace of the wall.