We made our way to St Denis on recommendation from a local Parisienne. the actual approac is very unimpressive but once inside it is awesome. It was Easter Sunday and so the local tour guides weren't on duty but we used an audioguide. We loved the fact that there was so much to see and explore. The tombs, statues and vaults and the history of the basilica is well worth the visit. There are so many churches and cathedrals in Paris and indeed European cities but this one is well worth the visit. Maybe because it is on the outskirts of Paris, there are not hordes of tourists and definitely no long queues. It is a highly recommended visit.