Photo: Japan's Ancient Underwater "Pyramid" Mystifies Scholars

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Stone formations resembling a step pyramid lie just off the coast of Yonaguni Jima, an island in Japan's Ryukyu archipelago.

These structures are the ruins of an ancient city that sank beneath the waves 2,000 years ago, according to a Japanese professor who has studied the site for 15 years. But other experts who have dived there are just as convinced that the site is almost entirely natural.

Photograph by Robert Schoch

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