Which sentences contribute to the overall eerie mood of this excerpt from “the cask of amontillado” by edgar allan poe?

"We had passed through long walls of piled skeletons, with casks and puncheons intermingling, into the inmost recesses of the catacombs." 

""We are below the river's bed. The drops of moisture trickle among the bones."

You need to breathe, and just count to 10 slowly, it .