Natural caves have been employed as churches or places of worship. Thus the Grotte des Fées, near Nimes, was used by the Calvinists for their religious assemblies before 1567, when they obtained the mastery of the town, sacked the bishop's palace, and filled up the well with the Catholics, whom they precipitated into it, some dead and others half alive. The Grotte de Jouclas, near Rocamadour, served the villagers of La Cave till the parish church was rebuilt. At Gurat, in Charente, the church of S. George is hollowed out of the rock; it dates from the tenth century, it is believed, and preceded the present parish church, which was erected in the eleventh century, and is Romanesque. In the valley of the Borrèze, near Souillac (Lot), is a cave in which bones of the _ursus spelœus_ have been found. It is used as a chapel to Notre Dame de Ste. Esperance. At Lanmeur, in Brittany, is the very early crypt of S. Melor, a Breton prince put to death about the year 544. The legend concerning him is rich in mythical particulars. His uncle, so as to incapacitate him from attaining the crown of Léon, cut off his right hand and left foot. The boy was then provided with a silver hand and a brazen foot. One day he was seen to use his silver hand in plucking filberts off a tree, whereupon his uncle had him murdered. The crypt is the most ancient monument of Christian architecture in Brittany. It measures 25 feet by 15 feet 6 inches, and is divided into a nave and side aisles by two ranges of columns hardly 4 feet high, sustaining depressed arches not rising above 3 feet 6 inches, and decorated with rudely sculptured trailing branches. [Illustration: Section of the Dolmen Chapel of the Seven Sleepers near Plouaret.] A still more curious subterranean chapel is near Plouaret, in Côtes-du- Nord. It is, in fact, a prehistoric dolmen under a tumulus, on top of which a chapel was erected in 1702-4. The descent into the crypt is by a flight of steps. The primitive monument consisted of two huge capstones of granite supported by four or five vertically planted uprights, but one, if not two of the latter have been removed. At the east end is an altar to the Seven Sleepers, and the comical dolls representing them stand in a niche above the altar. In the north-west of Spain, at Cangas-de-Ones, near Oviedo, is a little church of probably the tenth or eleventh century, built on top of a cairn that covers a dolmen. This latter consists of a circular chamber into which leads a gallery composed of fifteen upright slabs, covered by four others. The dolmen served as a crypt to the church, and from it have been recovered objects in stone and copper of a prehistoric period. A writer in the seventeenth century says that in his time devotees regarded the dolmen as the tomb of a saint, and scrabbled up the soil, and carried it away as a remedy against sundry maladies. [Footnote: _Revue mensuelle de l'ecole d'Anthropologie_, Paris, 1897.]