The tall building behind the church is part of the University of Paris, Pierre and Marie Curie campus, at Jussieu. The church-looking tower on the right is part of the Lycée Henri IV, a well-known Parisian high school.
The neighborhood is where the Romans built their city back in the day of Julius Caesar. Not far from this site is the old Roman amphitheater on the rue Monge, the ancient Roman forum, and the baths at Cluny. It's also very close to the spot (down the hill to the left) where Owen Wilson was picked up on his trips into the Parisian past in Woody Allen's film, "Midnight in Paris."