How do you predict eclipses at Stonehenge? Why do the Carnac alignments follow geological fault lines? Was Avebury intentionally sited precisely one seventh of a circle down from the north pole? Why are so many stone circles egg-shaped or flattened? What is the meaning of the designs in ancient rock art? Do you really have to wait nineteen years to visit the remote site of Callanish? What were the ancients up to? These are our oldest buildings, our first messages, our earliest visual art. With eight authors, and packed with detailed information and exquisite rare illustrations, Megalith is a timeless and valuable sourcebook for anyone interested in prehistory.

Hugh Newman is an explorer, megalithomaniac and author of 'Earth Grids: The Secret Pattern of Gaia's Sacred Sites', author of 'Stone Circles', co-author of 'Giants on Record', and a contributor to 'Megalith: Studies In Stone'. He is a regular guest on History Channel's 'Ancient Aliens' and 'Search for the Lost Giants.' He has articles published in Atlantis Rising (US), New Dawn (Australia) and numerous other publications. www.hughnewman.co.uk

Previously a senior lecturer and college department head, Robin, a regular speaker at Megalithomania and prolofic author, has taught surveying, navigation and mathematics for over 25 years. An internationally published author on astronomy, sacred geography and the megalithic culture of Europe, Robin has lectured on the sacred geography module at Bath Spa University College and teaches astronomy at an Oxford University FAS summer school. His books include Sun, Moon & Stonehenge, Bluestone Magic, The Measure of Albion (with John Michell) & Stonehenge (Wooden Books). www.skyandlandscape.com

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Robin Heath & Hugh Newman: Megaliths, A Study in Stone