If you can make it here without losing all of your money at the excessive number of check points check out the Basillique De Notre Dam De La Paix, its absolutely amazing, I was there for Christmas and went to a service, not religious, but it gives you time to just sit there and enjoy the stain glass windows and the architecture! Look up at the Dome if its sunny out its amazing. If you feel adventurous check it out at night, and snap a few pictures be careful but it is magnificent at night.  Oh and if you want to sit through the service then you don't have to pay anything to go inside