According to legend, Atlantis was an island in the Atlantic Ocean that Plato said was swallowed by an earthquake. In Plato's account, Atlantis was a strong naval power that conquered many parts of Western Europe and Africa, sinking into the sea after a failed invasion of Athens. In recent times, people have begun to take the Atlantis story seriously, inspiring utopian theories.
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Atlantis, The Lost Continent Finally Found
In a published work, Professor Arysio Santos claims to have located the lost continent of Atlantis under the South China Sea. The table of contents and excerpts from the book are included here, along with articles about the subject and a list of places where the book can be purchased, as well as a biography of the author and an online discussion forum. - Atlantis, The Lost Continent Finally Found
http://www.atlan.org/
The Discovery of Atlantis Project seeks to find the actual location of the legendary Atlantis, both through 3D maps and models showing a stretch of sunken land one mile beneath the waters of the Eastern Mediterranean sea. A book on the subject, authored by Robert Sarmast, is available for purchase online. Project updates, articles, interviews, and 3D models are also presented. - Discovery of Atlantis
http://www.discoveryofatlantis.com/
The Atlantis Project was a scheme to create a floating sea city named Oceania, which began in February of 1993, but ended in April of 1994 due to a lack of interest. An outline of the proposed project can be found here, including several images and concepts of the city. - Oceania: The Atlantis Project
http://www.oceania.org/
This site was formed as an outgrowth of two scientific papers and a book, published in 1979, the result of a life-long personal quest for verifiable evidence to support the existence of Atlantis, as recorded by Plato and others. A biography of the author, R. Cedric Leonard, is included, along with a summary of the book, ideas of the Atlantean alphabet, and a variety of other resources and accounts. - Quest for Atlantis
http://www.atlantisquest.com/