My grandfather immagrated from Italy around 1895. I have been trying to find his port of departure and arrival port in the USA but haven't had any luck on geneaology sites. Where can I go from here?

Are you sure it might not be a little later than the 1890's. The exact name isn't found in the Ellis Island database:  https://www.libertyellisfoundation.org/passenger-result but, the last name, hometown, and destination (Alleghany/Pittsburg, PA) matches. It's possible that your grandfather went by a different name. Pasquale could be a nickname or the middle name. A lot of my relatives' first names varied on censuses and the like. Sometimes their nick name would be listed, or their full name or the English version. Do you know his birth year? I also found on Ancestry.com a marriage record of a Pasquale Robertuccio in Fayette, PA: https://www.ancestry.com/search/?name=Pasquale_Robertuccio Most public libraries have access to Ancestry.com's records for free, you just can't save them to your tree if you have an Ancestry.com account, but you can look at it and print it out.

I also found on Ancestry.com a marriage record of a Pasquale Robertuccio in Fayette, PA: https://www.ancestry.com/search/?name=Pasquale_Robertuccio

Most public libraries have access to Ancestry.com's records for free, you just can't save them to your tree if you have an Ancestry.com account, but you can look at it and print it out.