My friend Mike suggested a couple other places to visit, and fortunately they were much closer than my first day of walking!
The Montmatre part of Paris is a rather steep hill about a mile from here. This is where the famous, or infamous, Moulin Rouge is located.
During WWII it became famous for the fancy girl shows that the soldiers liked. Apparently some of the young ladies were a tad loose morally, which was another reason soldiers were attracted here. This feels like a rather sketchy part of town with a lot of sex shops about. I would have felt less comfortable visiting here after dark. BTW, I did not go in. May watch the movie someday instead.
Up the hill from here is a much different attraction; the Sacre Coeur or Basillica of the Sacred Heart.
Catholics have got it all over Protestants for architecture! Mass was going on but you could still enter and marvel at the statues and mosaics. Still, being a place of worship, there was a dress code for entry.
Here are a few pictures from inside.
The main sanctuary

Incredible mosaic of Christ
