I recently came across this interesting article that the Lost City of Atlantis had been found on Google Earth. However these hopes were dashed when Google explained that the criss-crossing lines which keen observers had spotted what appeared to be the outline of a vast city, located 600 miles west of the Canary Islands were sonar data collected as boats mapped the ocean floor.
Google Earth has made many amazing discoveries including a pristine forest in Mozambique that is home to previously unknown species and the remains of an Ancient Roman villa.
http://tech.uk.msn.com/news/article.aspx?cp-documentid=14398655