AtD translation: Calvary Hill

[Mike Jing]

P657.14-20   She had been amusing herself by waiting for Rodolfo to fall
asleep and then getting decked out in scarlet lustra-cellulose, draping on
some Ambroid jewelry, and joining the girls who loitered by the end of the
tunnel, often finding herself late at night on hands and knees up on
Calvary Hill being penetrated by a small queue of tunnel hands, often two
at a time, who cursed her in unknown tongues—as she seemed eager to let
Reef know about the first chance she got.

What does "Calvary Hill" refer to here? I did look it up, but I'm still not
sure what it means here.