My kids and I visited the catacombs at the end of June. We did not have advance tickets, so arrived about 45 mins before opening and joined a growing line. My son took count: there were 121 people in front of us. There is no way to gauge how quickly the line would move once the catacombs opened. Unfortunately, it took much, much longer than anticipated - we entered the catacombs about 1.75 hours after it opened. I feel sorry for the 200+ people that were behind us. For those without advance tickets, entry is as follows: 10 people are admitted at a time, about every five minutes. however, all people with advance tickets and all group tours get immediate entry, so the effect is that for those in line things move very slowly.
Once inside the experience is interesting. Stacks and stacks and stacks of bones, nearly all organized with care and some organized in fun, even whimsical ways. You can meander through at your own pace. We took our time to look at the patterns and whimsy of those charged with relocating two million of Paris's dead.
The catacombs are an intriguing experience, but a nearly two hour wait in the hot summer sun made this trip less enjoyable than it otherwise could have been.
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