catacombs of paris: should tickets be purchased in advance?

catacombs of paris: should tickets be purchased in advance? - Blue Luggage with Folded Clothes

I'd like to see the Catacombs of Paris in September 2017. It appears that tickets can be purchased in advance from http://b12-gat.apps.paris.fr/accueil.aspx ... is the demand such that purchasing tickets in advance is necessary if you want to see it?

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Paris Catacombs - Is it Worth Visiting?

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