Picture this: the year is 1601, and you are the great Tokugawa Ieyasu, founder of the Tokugawa Shogunate. You rule over a Japan that's unified for the first time in centuries. But a rise to power is always accompanied by an influx of enemies. That's why, when Tokugawa Ieyasu built his great palace Nijō-jō in Kyoto, he made sure to install the era's state-of-the-art security system: a floor that announces intruders as well as any modern alarm.
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Written by Reuben Westmaas July 20, 2017
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