Cajuns refer to this as the 'Mother Church of the Acadians' as it was here in St. Martinville that the largest immigration of Acadians took place in 1785. The church is the focus of St Martin Square, where you'll find a number of monuments and statues. St Martinville's wider historic district is home to 32 buildings dating from 1820-1931, and the Longfellow-Evangeline State Historic Site.
If you go:
Behind the church sits the statue of Evangeline, the fictional Acadian heroine immortalized in Henry Wadsworth Longfellow's epic poem set in the time of the Expulsion of the Acadians.
Links:

133 South Main Street
St. Martinville, Louisiana 70582 USA
Phone Numbers:
+1 (337) 394-6021
St Martinville Tourist Information
+1 (337) 394-2233
+1 (337) 394-2233