Here are a few pictures and some of the practical information to get at the Cathedral Notre Dame.
A closer look on the door!
How to get at the Cathedral Notre Dame?
It is located at the heart of the city of Paris, and can be accessed by not only Metro lines but also RER.
Two RER lines - RER B and RER C serve this church. RER C, also goes to the Eiffel Tower. If you are going to visit Eiffel Tower after the Notre Dame, then you can simply take RER C and go to the Eiffel Tower.
Metro lines 4, and 10 also serve this church.
If you are not good with travelling in undergound trains - you can also ask for the bus information from the local / nearest tourism office.