The most overlooked prophecies in the world have come from the Popes of the 20th Century.

And the 19th Century, I might add.

I made that comment on a post quoting Pope Pius XII - before he ascended the Throne of Peter:

"I am worried by the Blessed Virgin's messages to little Lucia of Fatima. This persistence of Mary about the dangers which menace the Church is a divine warning against the suicide of altering the faith, in her liturgy, her theology and her soul... I hear all around me innovators who wish to dismantle the Sacred Chapel, destroy the universal flame of the Church, reject her ornaments and make her feel remorse for her historical past.

"A day will come when the civilized world will deny its God, when the Church will doubt as Peter doubted. She will be tempted to believe that man has become God. In our churches, Christians will search in vain for the red lamp where God awaits them. Like Mary Magdalene, weeping before the empty tomb, they will ask, 'Where have they taken Him?'"

--Eugene Cardinal Pacelli, future Pope Pius XII, 1931 - Creative Minority Report

I've been printing select quotes which foretold our times as well - from the Popes and the Vatican Documents they commissioned and approved.  Some say Heaven complains messages from the Blessed Virgin are not heeded, yet perhaps an even more serious offense is that the teaching of the Popes have been deliberately ignored and repudiated.

The following, from St. Pius X:

Thus then, Venerable Brethren, for the Modernists, both as authors and propagandists, there is to be nothing stable, nothing immutable in the Church. Nor indeed are they without precursors in their doctrines, for it was of these that Our Predecessor Pius IX wrote: These enemies of divine revelation extol human progress to the skies, and with rash and sacrilegious daring would have it introduced into the Catholic religion as if this religion were not the work of God but of man, or some kind of philosophical discovery susceptible of perfection by human efforts.' (Encyclical Qui pluribus, November 9, 1846) 

These men are certainly to be pitied, and of them the Apostle might well say: They became vain in their thoughts. . . professing themselves to be wise they became fools(Rom. i. 21, 22); but, at the same time, they excite just indignation when they accuse the Church of torturing the texts, arranging and confusing them after its own fashion, and for the needs of its cause. In this they are accusing the Church of something for which their own conscience plainly reproaches them.” - Source

And just to drive a few points home, this from Paul VI:

In the present period, the corruption of morals has increased, and one of the most serious indications of this corruption is the unbridled exaltation of sex. Moreover, through the means of social communication and through public entertainment this corruption has reached the point of invading the field of education and of infecting the general mentality. 

In this context certain educators, teachers and moralists have been able to contribute to a better understanding and integration into life of the values proper to each of the sexes; on the other hand there are those who have put forward concepts and modes of behavior which are contrary to the true moral exigencies of the human person. Some members of the latter group have even gone so far as to favor a licentious hedonism. - Persona Humana

From the first Pope:

Know this first of all, that in the last days scoffers will come [to] scoff, living according to their own desires ...

There were also false prophets among the people, just as there will be false teachers among you, who will introduce destructive heresies and even deny the Master who ransomed them, bringing swift destruction on themselves.  Many will follow their licentious ways, and because of them the way of truth will be reviled.

In their greed they will exploit you with fabrications, but from of old their condemnation has not been idle and their destruction does not sleep. - 2 Peter 2