Big white church made of marble that overlooks Paris. It's called Sacre Couer (Sacred Heart). There's live musicians and street performers that play on the steps of the church all night and there's drum circles. At 11pm the eiffel tower does it's nightly light show and it's pretty sweet. Just don't bring any wallets/passports or anything that can be stolen. I've been there about a dozen times and 7 times I've had people who I brought or accompanied up there had their passports/wallets/etc... stolen.
Next time your rolling around paris look for a big white church on a hill overlooking paris.

 

We spent most of Saturday there. We left about 10 We know all about the pickpockets. This is our 4th trip to Europe.