I have made some progress on this! I found the ship's passenger manifest for his arrival, and it gives his birth place as "Sessa A<something>" I'm thinking this could be Sessa Aurunica. I've attached the page, he's on line 13. Can anyone else make out the birth comune?

You may ask if there is the act of baptism of Pasquale in the diocesan archives of Gaeta:
http://www.arcidiocesigaeta.it/pls/gaeta/v3_s2ew_consultazione.mostra_pagina?id_pagina=54

Per informazioni di archivio contattare:
d.ssa Vincenza CIARLONE
tel. 339.5369889
email: vincenza.ciarlone@alice.it ...

Yes, they were married here in Boston.

Hello all,

I'm trying to find out anything I can about the birth of my great-grandfather, Pasquale Passerini. According to his immigration paperwork, he was born on 17 August 1895 in Elena, Italy. I did the research and found out that it was later incorporated into Gaeta. I had the vital records ...