I might have missed this Holy Grotto, if I had not had a local Christian guide--it was quite empty, compared to the Church of the Nativity, even though it is located very close by.

La “Gruta de la Leche
” A unos 200 metros de la venerada Iglesia de la Natividad, donde la tradición sitúa el nacimiento de Jesús, se encuentra la caverna, de forma irregular y excavada en una roca caliza de color blanco, denominada la Gruta de la Leche.El santuario es custodiado por la orden franciscana y una decena de monjas adoratrices llegadas a Tierra Santa en julio pasado.
"Se dice que allí reposó la Virgen María antes de huir a Egipto, y sentada sobre una roca dando de mamar al Niño, … [More]

The Milk Grotto (officially Magharet Sitti Mariam, "Grotto of the Lady Mary") is a serene grotto only a few minutes' walk from Manger Square in Bethlehem. This grotto, with a Franciscan chapel built above it, is considered sacred because tradition has it that the Holy Family took refuge here during the Slaughter of the Innocents, before their flight into Egypt. Tradition has it that while Mary was nursing Jesus here, a drop of milk fell to the ground, turning it white. The irregularly shaped … [More]