Ein Karen, Saint John the Baptist Church

Inside the church  of St John the Baptist are the remains of an ancient mosaic floor and a natural grotto — identified as John’s birthplace and believed to be part of his parents’ home.

See:

1. https://biblewalks.com/Sites/StJohnBaHarim.html
2. Jack Finegan, The Archeology of the New Testament: The Life of Jesus and the Beginning of the Early Church (revised ed.). Princeton University Press. p. 4.
3. Félix-Marie Abel, Geographie de la Palestine. Vol. 2 Geographie Politique. Les villes. Librairie Lecoffre 1938, pp. 295f
4. Moshe Sharon, Corpus Inscriptionum Arabicarum Palaestinae, D–F. Vol. 3. BRILL 2004.