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I only figured this out through some strokes of luck at Googling. It is a ruined city called Nan Madol on the island of Pohnpei in Micronesia:
6°50?41?N, 158°20?6?E
http://en.wikipedia.org/wiki/Nan_Madol
Part of what threw me off was that I was convinced at first that it had to be Mesoamerican, so I kept looking in the Yucatan. It didn’t occur to me for a while to look in the Pacific.
Comment by Ben Bayer | March 3, 2008
beach in micronesia @ 6°50′N 158°19′E
Comment by roland | March 3, 2008
Pfff, it was hard this time, but it is the Pohnpei island, one of the largest islands in Micronesia. And to be more specific: the Nan Madol ruins.
Comment by Karel | March 3, 2008