I recently saw a program on Discovery HD where this guy had been looking for Atlantis on land. He believed that the basin that Atlantis sat in was filled by a cataclysmic tidal wave and eventually filled in with silt explaining the story that it had been swallowed by the ocean. So, Atlantis would actually be underground. So, he began digging in a basin (I believe in Spain) that was close to the Atlantic ocean and found some ruins that seemed to date back to the time of Atlantis. But, as with all of those archaelogy shows, they never give you a definitive answer at the end of the program. Now, I see THIS ARTICLE that says a structure fitting Plato's description of Atlantis has been found in Spain and can be seen from satellite photos. Although.. I don't see it, personally, I do find this stuff fascinating. I mean, Homer's Troy was never thought to exist until it was unearthed in 1873.