Most romantic spot in Paris?

I've always loved cemetries, (ok, I was a goth for a period), and a stroll in Père Lachaise is a "must-do" with visiting friends. There is only so many times you can sight-see some of the major monuments but I'll never grow tired of wandering through the "streets" which make up the biggest burial site in Paris. The only grave we looked for was that of tragic lovers Abélard and Héloïse which was moved here in 1817. The rest of the time there is no need to search, just walking around is bliss. We didn't go to see Jim but we sung a bit of "The End" and "The Crystal Ship" in his honour on the way home.