It's in an area called Montmatre where many famous artists called home back in the day. It is one of the only hilly areas in Paris so it has some amazing views of the city. Unfortunately it is extremely touristy now.
This was taken at a party in school...they decorate the school at night and throw huge parties with DJs, bands, dancing and open bars! I love this place.
Eglise St. Eustache. My Lonely Planet Guide to Paris describes it as one of the most beautiful in Paris...I have to agree. It's being restored presently.