The archeology in Algeria is rich in prehistoric memorials of human occupation. Algeria contains many Roman remains and is rich in monuments of Saracenic art. Megalithic remains Algeria has many megalithic remains, of which nearly every known kind has been found in the country. Numerous flints of palaeolithic type have been discovered, notably at Tlemcen and Kolea. Near Djelfa, in the Great Atlas, and at Mechra-Sfa ("ford of the flat stones"), a peninsula in the valley of the river Mina not far from Tiaret, are vast numbers of megalithic monuments. Notable among the prehistoric cultures of the area is the Capsian culture, whose shell-mounds are found throughout the north. Famous sites Madghacen Madghacen is a monument similar to the Qabr-er-Rumia, but older. It was built around 150 B.C. as the burial place of the Numidian kings, and is situated southwest of Constantine. The form is that of a truncated cone, placed on a cylindrical base, in diameter. It is high. The columns encircling the cylindrical portion are stunted and much broader at the base than the top; the capitals are Doric. Many of the columns, 60 in number, have been much damaged. When the sepulchral chamber was opened in 1873 by Bauchetet, a French engineer officer, clear evidence was found that at some remote period the tomb had been rifled and an attempt made to destroy it by fire. Qabr-er-Rumia The Qabr-er-Rumia-- best known by its French name, Tombeau de la Chrétienne (grave of the Christian lady), tradition making it the burial-place of Florinda, la Cava Rumía, the beautiful and unfortunate daughter of Count Julian—is near Kolea, and is known to be the tomb of the Mauretanian king Juba II and of his wife Cleopatra Selene, daughter of Mark Antony and Cleopatra, queen of Egypt. It is built on a hill above the sea. A circular stone building surmounted by a pyramid rests on a lower platform, square. Originally the monument was about in height, but it has been wantonly damaged. Its height is now : the cylindrical portion , the pyramid The base, in diameter, is ornamented with 60 engaged Ionic columns. The capitals of the columns have disappeared, but their design is preserved among the drawings of James Bruce, the African traveller. In the centre of the tomb are two vaulted chambers, reached by a spiral passage or gallery , about the same height, and . The sepulchral