The Franklin series was filmed in several neighborhoods in Paris. 

Filming locations:

Palais of Versailles

In the movie

Scene where Benjamin Franklin arrives at the Palais of Versailles.

In reality

The scene was filmed in the Marble Court of Versailles. It is a small marble square in front of the main entrance to the palace.

Theater

In the movie

Scene where Benjamin Franklin is welcomed in the theatre.

In reality

The scene was filmed The Opera-Comique, an opera house in Paris founded in 1705, stands out for its very rich interiors.