Where is Montresor bringing Fortunato?

Montresor brings Fortunato into the catacombs beneath his home. Montresor knows all his servants will be away enjoying the Mardi Gras celebrations, so his home is empty. Montresor leads the drunken Fortunato down a winding staircase into the dark, damp catacombs. Catacombs, or cemeteries the Romans built under ground, have ledges against the walls on which they put dead bodies, so they pass old bones. Their way is lit only by the two flambeaux or torches that they carry. A webwork of white mold lines the walls, causing Fortunato to cough. They pass under low arches, and the mold--or nitre--on the walls increases, making the walls look mossy. Finally, they enter into a crypt and at the end of it, a smaller crypt, lined on three sides with human bones. Beyond that is a small niche. This is the final destination, where Montresor chains Fortunato up and bricks him in to die.