Saint-Ambroise Church
This is an off-the-beaten path church of Paris as it is located in the 11th arrondissement, so off the center. Though if you are staying in the area and appreciate architecture, you will enjoy the detour.
The church is named after Saint-Ambroise and was built from 1863 in just five years! The architectural style is referred as "eclectic" as it mixes neo-gothic, neo-roman and neo-byzantine...
The two towers with their spears are reminiscent of cathedrals. As a matter of fact, they are 68 meters high, just a meter short of that of Notre-Dame...