Iran, Ali Sadr: the caves at Ali Sadr are the biggest water caves in the world, with 11 kilometres of navigable waterways. Known to antiquity, but o

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Iran, Ali Sadr: the caves at Ali Sadr are the biggest water caves in the world, with 11 kilometres of navigable waterways. Known to antiquity, but only rediscovered in 1963. One of the largest stalagmites.

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Photo credit: © Peter Michael Rhodes / Alamy / Afripics
License: Royalty Free
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Keywords: caverns, islam, muslim, persia, shi-ite, speleology, stalactites, stalagmites, underground