Interesting article. A certain young fan of Riordan’s might find it neat to see how archeology and mythology sometimes cross.
No need to excerpt from The Smithsonian. You already paid for it. ;)
This is awesome.
Perhaps a NATURAL cave existed there and the Greeks further excavated and expanded it.
Robert Temple devotes many chapters to this in his book,Netherworld, which I found very interesting.
http://www.amazon.com/Netherworld-Robert-Temple/dp/009941466X/ref=sr_1_3?ie=UTF8&qid=1349539895&sr=8-3&keywords=netherworld
