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The Ninja Museum
If you want to know more about ninjas, take a trip to the Ninja Museum in Igaryu, Mie Prefecture. The museum is made to resemble a ninja house, where the ninjas had meetings, made weapons, and prepared gunpowder. From the outside, it looks like a nondescript farmhouse, but inside, the house is an ingenious mix of hidden pathways and defense systems to trap enemies.
http://www.iganinja.jp/?page_id=837
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The Secret Traditions of the Shinobi
Available at www.amazon.com
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Azumi
Available at www.amazon.com