Lemuria is just as legendary as Atlantis & it apparently goes further back into history.
http://en.wikipedia.org/wiki/Kumari_Kandam, www.youtube.com, www.lemuria.net/maps/index.html, www.burlingtonnews.net/leumurian1.html, www.lemuria.net/links.html, www.youtube.com, www.worldatlas.com/aatlas/infopage/oceans/indianocean.htm, www.sacred-texts.com/atl/ataw/index.htm, www.grahamhancock.com/gallery/underwater/japan-other.htm, www.worldatlas.com/aatlas/infopage/oceans/pacificocean.htm, www.bibliotecapleyades.net/arqueologia/esp_ruinas_yonaguni_5.htm,
www.atlan.org, www.amazon.com/Atlantis-Lost-Continent-Finally-Found/dp/1556439563/ctoc
Frank J. Hoff provided a lot of interesting ideas on, coasttocoastam.com.
Of course, remnants of various civilizations can be found all over the world.
www.disinfo.com/2012/01/graham-hancock-on-ancient-mysteries, www.youtube.com,
http://otherworldmystery.com/tag/graham-hancock, www.youtube.com/user/GrahamHancockDotCom,
http://thehiddenrecords.com/mars,
www.worldatlas.com/aatlas/infopage/oceans/atlanticocean.htm,
www.reuters.com/article/2011/03/12/us-tsunami-atlantis-idUSTRE72B2JR20110312,
www.dailymail.co.uk/sciencetech/article-2167731/Britains-Atlantis-North-sea--huge-undersea-kingdom-swamped-tsunami-5-500-years-ago.html