Conciergerie is not a museum I recommend, although its central location and a low admission price may look tempting. The highlights of Conciergerie are the Women’s Courtyard and Marie-Antoinette’s Chapel constructed in 1815 on the spot of her prison cell.
The Women’s Courtyard still has a stone table where the women ate and the fountain where they washed their clothes. As for the Chapel, it is remarkable as an early place of Marie-Antoinette’s cult; consequently, if you are in Paris to worship, then pay to me no attention, this is where you must go.
As for the reconstructions and the few artifacts there, they are not worth the seven euros. However the little plastic Marie-Antoinette in the souvenir shop is only 6,50! No toy guillotine though, sorry.