Two years back there was a news about a satellite photo from NASA showing what looked like a bridge between India and Sri Lanka. The buzz was that we had discovered the bridge that Rama had built in the mythology Ramayana. The "Hindustan Times":http://www.rense.com/general30/nasa.htm had written
bq. The bridge’s unique curvature and composition by age reveals that it is man-made. Legend as well as Archeological studies reveal that the first signs of human inhabitants in Sri Lanka date back to the primitive age, about 1,750,000 years ago and the bridge’s age is also almost equivalent.
But according to the findings at the Centre for Remote Sensing (CRS) of Bharathidasan University, Tiruchi, the "bridge is only 3500 years old":http://www.gisdevelopment.net/news/viewn.asp?id=GIS:N_ytfseizr
bq. Carbon dating of ancient beaches found west of Uchichipuli in Ramanath puram district put their age at 3,500 years. These were clear examples that the sea had receded from Thiruthurai poondi and Kodiyakarai as well as from Ramanathapuram to the west of Unhchipuli, around 3,500 years ago. The sea may have receded to Pamban only during this period. Because of such divergent littoral currents, there remained a current shadow zone between Dhanushkodi and Talaimannar and hence the sand brought by the currents had been dumped in a linear pattern in the current shadow zone. Corals might have accumulated over these linear sand bodies, later on Ramasamy said. So the land bridge is only the sand, which had begun accumulating in the current shadow zone 3,500 years back, and continues to the present day. Therefore, the age of the Adams bridge could only be 3,500 years old, he asserted.
Now "floating stones":http://www.webindia123.com/news/showdetails.asp?id=39237&cat=India have been discovered in Rameshwaram.
bq. G. Mohan Das, a local historian and caretaker of the stones in the temple, said that these stones could have been the kind used to build the mythological bridge. "The history of these floating stones is that when Lord Rama made a bridge to trek to Lanka to bring back his consort Sita, these are the same stones used. But today’s educated people do not agree to it. They believe it is a coral which is in Australia, Chennai, in small islands. We believe there is no difference in these stones. Both the stones do not have air in them. The composition is the same and it has 40 kinds of chemicals," he said.