The Cauldron is a residential and commercial area adjacent to the French Quarter of New Orleans. It is also the main area that belongs to the witches within the City, the other being Lafayette Cemetery that includes the Lycée.
The Cauldron is the headquarters of the witches in the French Quarter. It is located near Bourbon Street where there is Rousseau's, the restaurant formerly ran by the Deveraux sistes, Jane-Anne and Sophie. It is an open space between residential buildings with shops on the ground floor, such as the Jardin Gris voodoo emporium, formerly managed, first by Katie and later by Genevieve; current ownership is unknown. The open space is exploited by witches rigging tables outside to do tarot readings, palmistry and street vending trinkets, souvenirs and spells to tourists, while at night the same tables are used by witches in the area to spend the evening together.
Throughout The Original Series
The Cauldron is often the area of fights between vampires and witches, as when Marcel sent Diego and other vampires to teach a lesson to the witches doing a little mess by overturning tables and breaking merchandise in shops. In Tangled Up In Blue, it was during one of these raids that Thierry killed one of the vampires who had assaulted his girlfriend, the witch Katie, owner of the Jardin Gris voodoo shop.
In Gather Up the Killers, Marcel asked Vincent Griffith to keep witches at The Cauldron to avoid that there were unpleasant encounters with European vampires, like Alistair Duquesne, just arrived in town to witness Niklaus Mikaelson's defeat at the hands of Marcel. Vincent accepted his request as long as the vampires had not caused problems to the witches.