The Indus Valley is one of ancient history's most mysterious and little-known civilisations. This title explores what is known about this area of India and Pakistan discovering how they built grid systems invented modern plumbing and traded with their neighbours in this fascinating title.|The Indus Valley is one of ancient history's most mysterious and little-known civilisations. This title explores what is known about this area of India and Pakistan discovering how they built grid systems invented modern plumbing and traded with their neighbours in this fascinating title.