Amazing pictures of the sewer system under one of the cities in japan. The first sewerage system "in Japan can be seen in the large communities in the Yayoi Period (approximately 2,200 years ago). In the Nara Period (about 1,300 years ago), a drainage system network ran throughout the city in the Heijo-kyo capital area. In the Azuchi-momoyama Period (approximately 430 years ago), a stone culvert called the Taiko Sewerage was built around Osaka Castle."
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