The figures reaching toward each other at the top are not who you'd think, given the title of this relief. The one on the left holds a model of Notre Dame on her lap and sits on a ship that's centuries out of date. Behind her swirls a banner with the motto "Fluctuat nec mergitur" - "It is tossed on the waves but doesn't sink." That's the motto of the city of Paris, and the old-fashioned ship is also part of the coat of arms.
At the right is a figure in front of a towering skyline; her banner reads "New York." Her peculiar chair is probably the latest in transatlantic liners.
Below these two are the Three Graces. Among the Greeks, the most common identification of the Graces is as Zeus's daughters Aglaia, Thalia, and Euphrosyne - Beauty, Good Cheer, and Joy. Here, according to the inscriptions accompanying them, they're Poesie (Poetry - staring off into space, as poets will do), Beaute (Beauty - looking a lot like Botticelli's Venus), and Elegance (who seems to be thinking about a primitive form of haute couture).