L’église Saint-Eustache is a Gothic style church, built between 1532 and 1632. I did briefly enter this building a few years ago, but there was a mass going on, and therefore I postponed exploring it. This time, it was free, so I was free to meander inside.
As you can see, the exterior has plenty of Gothic elements to it. I wouldn't be surprised to see a gargoyle in this architectural environment.
The interior on the other hand, is very dark and gloomy. I must say that this isn't a welcoming place at all. I would be scared, to be honest. I wandered around, exploring its nooks and crannies, yet the overall feeling I had was of darkness. This is perhaps one building that I wouldn't want to be trapped at the end of the day.