The abbey church must have fallen into complete ruin, when a portion of it was restored and rebuilt in the fifteenth century. Then about half the nave--the western end--was cut off, and left open to the weather. It is roofless, and the visitor walking, now in deep shadow, now in brilliant light, as the fragments of masonry may hide or reveal the sun, sees the blue sky through the arches and over the tops of the ivy-covered walls. This part of the old church shows the transition between the Romanesque and the Gothic styles.
It would have been a slight upon Marcillac had I left the place without seeing the most famous of its caverns, which goes by the name of the Grotte de Robinet. I might have looked for it in vain all day had I not taken a guide.
First, the _causse_ had to be reached by ascending the cliffs on the right bank of the Célé. Then I saw before me the stony undulating land, with the sad sentiment of which I had already grown so familiar. An old woman, nearly doubled up with age and field labour, but who plied her distaff as she led her black goats to browse upon the waste, made me understand that the solitude was not altogether bereft of human life. After walking a mile or so, we descended into a deep hollow wooded with those dwarf oaks which, together with the juniper, hid at one time most of the nakedness of these calcareous tracts that stretch from gorge to gorge. One might have supposed that such a dale would have had a spring at the bottom; but no: everywhere it was parched, arid, and rocky. The rain that falls all around goes to swell some deep subterranean stream that issues no one knows where. This peculiarity of the formation explains why nearly all the _caussenards_ have no water, either for themselves or their animals, except that which they collect from the skies in tanks sunk in the earth. Since the failure of the vines--which formerly flourished upon the _causses_ wherever there was a favourable slope--the peasants have learnt to make a mildly alcoholic liquor by gathering and fermenting the juniper berries, which previously they had never put to any use.
We had nearly ascended the opposite side of this wooded hollow, when the guide, pointing through the sunlit trees to a very dark but narrow opening in the rocks, said, 'There it is!' We had reached the cavern. He went first, carrying aloft a wisp of burning straw, which he renewed from time to time from the bundle that he carried under his arm.