My wife came across this attraction when we were looking for things to do on our 3 day stay in Paris; while a short part of our day, this is definitely an attraction we'll remember.
We stayed at the Hotel Cluny Sorbonne in the Latin quarter, making it very easy to hop on the RER B for a quick 10 minute train ride to the denfert-rochereau station; we exited onto the Place Denfert Rochereau and the Catecombs were right across the street.
We had heard from other reviews to ensure to arrive early (at least an hour before the opening time) to make sure you are able to get in. In March I figured we'd be pretty safe, but I'm very glad we made it there when we did (about 09:10); the line already had about 25-30 people in it, and by the time we made it actually opened, the line stretched back for a few blocks - eek.
Leung they started letting people in, it only took about 10-15 minutes before our turn came. I being 26, my wife 24, permitted us to pay half price admission (4€ each), make sure you have your ID to snag any discounts such as these.
We opted to do our own touring (i.e. No tour guide, no audio guide), and it was fine. From what I heard in passing a few groups, I felt like the tours were focused more on the stone formations and tectonic shifts rather than the ossuary portion.
The steps down were manageable; nothing too crazy, but there are 100+ of them; the climb back up boasts about the same. The walk through the tunnels is eery, and if you find yourself separated from the group, you can feel the ominous nature of the place, passing dark rooms that look like black holes with no end. I was able to snag a couple great photos of some of the stone work and hallways.
The ossuary comes up on you quick if you're not prepared for it: tunnels, tunnels, tunnels, BAM! Rooms and rooms of skulls and bones; like nothing my wife, nor I, had ever seen before. I got some great pictures, just be advised if you're coming equipped with a basic point/shoot digital camera, the lighting may be inadequate unless you hold your hands very steady (no flash allowed). Of course, that didn't stop a few groups from snapping/flashing away with their iPhones and small pocket cameras.
Also note that video is not permitted; I was ignorantly filming my wife as we passed through some of there rooms and was immediately greeted with a firm, "No video Monsieur" by one of the employees, whoops.
When you exit the final set of stairs, there's a little gift shop selling random skull/bones trinkets; obviously fed by a steady stream of American/British tourists, haha.
All in all, a great little stop that not many people care to venture south of the Tower for; I would recommend it to anyone wanting to get something a little less mainstream from their time in Paris. MAKE SURE YOU ARRIVE EARLY!
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