A 937 eruption at Mount Fuji left a cave shaped like a womb
by Popkin from Boing Boing on (#77GPZ)
In the year 937, Mount Fuji erupted and sent the Ken-Marubi lava flow down its northern slopes and over a stand of fallen trees. The lava hardened around the trunks while the wood inside burned away, leaving long hollow tubes in the ground. - Read the rest
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