Recently, Stanczyk was asked about a Pennsylvania family and if I could find their ancestral villages, so they could make a family pilgrimage to get in touch with their Genealogical Roots.
See the red annotation (circle / underline) near the map center. This is region as shown from a 1757 map of the Polish / Lithuanian Commonwealth.
One of the immediate points of this region needs to be made explicit. Obviously, it was a part of the Lithuanian Duchy before, then Part of Poland, it became part of Prussian-Poland partition, then part of the Russian Empire, before becoming Lithuania in modern times.
That much border re-drawing causes a lot of languages / archives to come into play. Records can be expected to be found in Latin, Lithuanian, Polish, German, Hebrew/Yiddish and Russian.
The region is known in various languages. So I sought out JewishGen ShtetlSeeker to help me learn all of the various names and here is the pop-up if you hover over the Alytus name:
Most researchers will want to take note of it as Olita in Suwalki wojewodztwo (when in the Polish Kingdom) or as Oлита (Russian/Cyrillic) in Troki uyezd, Vilna gubernia.
Family Search has microfilm for both Catholic and Jewish metrical books:
Pradziad has some archival records too. Their records are for Jewish metrical records in the year range: 1835-1872 .
Obviously, if you visit the locale, then parish records may exist in Udrija or Baksiai parishes/synagogues in the Alytus region of Lithuania. Besides the Catholic records, there may also be Lutheran records too.
A more modern map (Olita/Alytus) can be found on the Polish map site mapywig.org . Please NOTE this is a large / detailed map. The area of this article is in the left-center area on the river.