FIGURE PAGE 1. Plan of Stonehenge 16 2. Avebury and Kennet Avenue 23 3. Plans of English Long Barrows 31 4. Horned tumulus, Caithness 39 5. Plans of three dolmen-types 40 6. Type-plan of simple corridor-tomb 42 7. Type-plan of wedge-shaped tomb 44 8. Corridor-tomb at New Grange, Ireland 47 9. Corridor-tomb at Ottagarden, Sweden 53 10. Plan of La Pierre aux Fees, Oise, France 61 11. Chambered mound at Fontenay-le-Marmion, Normandy 63 12. Plan of La Grotte des Fees, Arles, France 65 13. The so-called dolmen-deity, Petit Morin, France 66 14. Plan of corridor-tomb at Los Millares, Spain 69 15. Section and plan of a _talayot_, Majorca 72 16. Section and plan of the _nau_ d'Es Tudons 73 17. Elevation, section and plan of a Sardinian _nuraghe_ 83 18. Plan of Giant's Tomb at Muraguada, Sardinia 87 19. Plan of stone circle at the Senam, Algeria 94 20. Plan of the Sese Grande, Pantelleria 97 21. Plan of the Sanctuary of Mnaidra, Malta 99 22. Dolmen with holed stone at Ala Safat 115 ROUGH STONE MONUMENTS CHAPTER I INTRODUCTION To the south of Salisbury Plain, about two miles west of the small country town of Amesbury, lies the great stone circle of Stonehenge. For centuries it has been an object of wonder and admiration, and even to-day it is one of the sights of our country. Perhaps, however, few of those who have heard of Stonehenge or even of those who have visited it are aware that it is but a unit in a vast crowd of megalithic monuments which, in space, extends from the west of Europe to India, and, in time, covers possibly more than a thousand years.