Okay, I have found out, per Wikipedia, that apparitions depend upon when they occurred. The Congregation for the Doctrine of Faith was founded in 1542. Thus, apparitions fall into pre and post 1542.
Pre 1542-
Our Lady of the Pillar, Zaragoza, Spain (39 AD)
Our Lady of the Snow, Rome, Italy (need date)
Our Lady of Walsingham, England (1061)
Our Lady of the Rosary, Prouille, France (1208)
Our Lady of Mount Carmel, Cambridge, England (1251)
Post
Guadalupe, Laus, Rue-de-Bac (Miraculous Medal), La Salette, Lourdes, Pontmain, Fatima, Beauring, Banneux, Akita
Akita is the most modern of the Post 1542 apparitions.