The attraction isn't immediately The wide, straight boulevard du Montparnasse is plain by Paris standards.
Running parallel to Montparnasses is du Frosehamp, which houses the childhood lodging of Napoleon. 
mnli hypothesis: Running parallel to Montparnasses is du Frosehamp, which houses the childhood lodging of Napoleon.  premise: The attraction isn't immediately The wide, straight boulevard du Montparnasse is plain by Paris standards.