The Sacre Coeur has become one of the iconic landmarks of Paris, because of its unusual eastern style architecure, white stonework and the location at the top of la butte de Montmartre.
But as a ‘must see’ destination for short Paris breaks I’d have to give a few warnings. There’s not so much to do or see as you might think. The interior of the church is dark, because the stones from which is was made have the peculiar characteristic of being white only when exposed to sunlight. And the church is not really that old.

On the other hand the view from the top presents one of the few opportunities to look out over Paris, spot the eiffel tower, chatelet, Montparnasse tower, the Opera and the rest of the parisian skyline.

So on a sunny day it may be worth climbing all the steps for the view and the sense of being outdoors above the city. There is a funicular railway which is sort of part of the metro system but last time I was there it was closed for safety reasons, a bit like La Samaritaine.