Does anyone know the title or author of the poem from the movie Darby O'Gill and the Little People?

THE PILLAR TOWERS OF IRELAND by Denis Florence MacCarthy

The pillar towers of Ireland, how wondrously they stand

By the lakes and rushing rivers through the valleys of our land;

In mystic file, through the isle, they lift their heads sublime,

These gray old pillar temples, these conquerors of time!

Beside these gray old pillars, how perishing and weak

The Roman's arch of triumph, and the temple of the Greek,

And the gold domes of Byzantium, and the pointed Gothic spires,

All are gone, one by one, but the temples of our sires!

The column, with its capital, is level with the dust,

And the proud halls of the mighty and the calm homes of the just;

For the proudest works of man, as certainly, but slower,

Pass like the grass at the sharp scythe of the mower!

But the grass grows again when in majesty and mirth,

On the wing of the spring, comes the Goddess of the Earth;

But for man in this world no springtide e'er returns

To the labours of his hands or the ashes of his urns!

Two favourites hath Time--the pyramids of Nile,

And the old mystic temples of our own dear isle;

As the breeze o'er the seas, where the halcyon has its nest,

Thus Time o'er Egypt's tombs and the temples of the West!

The names of their founders have vanished in the gloom,

Like the dry branch in the fire or the body in the tomb;

But to-day, in the ray, their shadows still they cast--

These temples of forgotten gods--these relics of the past!

Around these walls have wandered the Briton and the Dane--

The captives of Armorica, the cavaliers of Spain--

Phoenician and Milesian, and the plundering Norman Peers--

And the swordsmen of brave Brian, and the chiefs of later years!

How many different rites have these gray old temples known!

To the mind what dreams are written in these chronicles of stone!

What terror and what error, what gleams of love and truth,

Have flashed from these walls since the world was in its youth?

Here blazed the sacred fire, and, when the sun was gone,

As a star from afar to the traveller it shone;

And the warm blood of the victim have these gray old temples drunk,

And the death-song of the druid and the matin of the monk.

Here was placed the holy chalice that held the sacred wine,

And the gold cross from the altar, and the relics from the shrine,

And the mitre shining brighter with its diamonds than the East,

And the crosier of the pontiff and the vestments of the priest.

Where blazed the sacred fire, rung out the vesper bell,

Where the fugitive found shelter, became the hermit's cell;

And hope hung out its symbol to the innocent and good,

For the cross o'er the moss of the pointed summit stood.

There may it stand for ever, while that symbol doth impart

To the mind one glorious vision, or one proud throb to the heart;

While the breast needeth rest may these gray old temples last,

Bright prophets of the future, as preachers of the past!