Cong Abbey is a large building nearly 150 feet in length. Few of the ancient churches of Ireland are any longer, and many of them are not nearly so long. It would be a mistake to say that the ruins at Cong are in a good state of preservation, for traces of violence and vandalism are apparent almost everywhere on them. The whole place has a terribly dilapidated look. It has been said that only for ivy and the Guinnesses the Abbey of Cong would have tumbled down long ago. It is true that ivy has prevented great masses of masonry from falling; and it is true that the late Sir Benjamin Guinness did a good deal of mending on the old walls. But it was before his time, when religious intolerance was worse than it is at present, that Cong Abbey was mutilated and defaced. It is sad to know that there is hardly an old religious edifice in Ireland that has not suffered from sectarian animosity. The ruins of Mellifont, near Drogheda, have been torn up from their foundations, so that hardly a trace of that once magnificent abbey now remains except the crypts and the vast walls and fosses by which it was surrounded. Ruthless vandals tried their best with sledges and hammers to overthrow the great cross of Monasterboice in Louth, but the stone of which it consists was too hard for them, for they only succeeded in mutilating what they could not destroy.
In its present dilapidated condition it is hardly possible to form a correct idea of what Cong Abbey was in the days of its splendour. It is almost impossible, also, to form an exact idea of its general plan, for many comparatively modern additions have evidently been made to it. Its having been used as a burying place within recent times has, as the same thing has done at Clonmacnois, sadly interfered with its picturesqueness. But, as at Mellifont, "enough of its glory remains" to show that it must have been a building of exquisite beauty. Some of its floral capitals carved on limestone are as fine specimens of the carver's art as can be found anywhere in the world. Both Sir William Wilde and Doctor Petrie agree in this. There was probably no abbey in Ireland that contained more beautiful specimens of the carver's art than Cong. Vast numbers of its sculptured stones have been defaced by vandalism or carried away to build walls or out-houses. It is not easy to know what was the exact extent of the gardens or mensal grounds of the abbey, for the walls that enclosed them cannot be fully traced, and are not intact like the walls around the Abbey of Boyle in the County Roscommon. The Abbey of Cong seems to have been the great depository for the precious things of the province of Connacht. The Order of Augustinians, to whom it belonged, was very rich, and had vast possessions in the province, and it would seem that no abbey in it was as rich as that of Cong. In it were kept deeds, books, records, and many other precious things, all of which have disappeared save the marvellously beautiful cross now to be seen in the Dublin Museum, and which artists and connoisseurs have pronounced to be "the finest piece of metal work of its age to be found in Europe." It is known from the Gaelic inscription on the Cross of Cong that it was made in Roscommon, for the name of the maker is identified with that town. The fact of such a priceless relic and such a gem of art having been kept in the Abbey of Cong shows that it was considered to be the most important and most secure place in the province. The Cross of Cong was supposed to be formed from part of the real cross. The Irish inscription on it is perfectly legible, and can be easily understood by any one who knows the modern language. The name of the maker is on it, and also that of Turloch O'Connor, who claimed to be chief King of Ireland, and for whom it was made in the year 1123.