What used to be a small town is now a suburb of Paris. Starting about 1400 years ago the kings of France were buried here. The current basilica was built in the 1200's on the site of a former church. This is also the first all Gothic church in the world and worth the effort if you have an idea who these people are. I'd recommend brushing up on French history before going. There's a book on Amazon called A Brief History of France that will help out immensely.