A man-made cave of wonders: the world’s biggest underground storm drain in Kasukabe, Japan

Deep beneath the ground, 19 miles north of Tokyo, lies a truly incredible feat of engineering. The G-Cans Project is the largest storm drain on earth, a colossal series of underground silos and tunnels, built to protect Tokyo from flooding during typhoon seasons. Its main hall (actually an enormous water tank) is held up by 59 columns each 25 metres high, and is known as the “Underground Temple”.

The facility is free to visit by guided tour, and the folks at Another Tokyo, a Japanese website introducing off-the-beaten-track places from around the country, recently went to check it out. This is what they found!

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