Sacré–Cœur Basilica is located on Montmatre in Paris, and (especially) if the weather is nice, the view can give you a nice idea of the size of Paris. (It’s pretty big…)
This picture was taken in June of 2010. And if I remember correctly, I did not see the Eiffel tower from outside of the church, which was a slight disappointment. But it was a nice view none-the-less, and absolutely worth a visit if you find yourself in Paris.