See what they're saying about:
  Lost Continents    Lost Civilizations    Hollow Earth    Lost Worlds    Lost Lands    Ancient Empires    Subterranean Civilizations     Sunken Continents    Vanished & Lost Races

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And more specifically:
  Agharti    Airyana Vaejo    Angaraland    Antichthon    Atlantis    Daitya    Drogio    Eden    Eea    Eldorado    Gondwanaland    Hyperborea    Kanghwa    Kumari Kandam    Laurasia    Laurentia    (Theosophical) Lemuria    Leng    the Lowland Hundred    Lyonesse    Megan­thropus & Gigantan­thropus    Mound­builders    Mu    Ogygia    Osirian-Rama    Ponapé    Poseidonis    Rapanui    Shambala    Shasta    Skherya    Stonehenge    Thüle

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And check these sites:
  Ancient Alternatives    Alternative Archaeology    Alternative Geology    Ancient Civilizations    Atlantean Lore    Atlantean Myths    DailyGrail    Lost Civilizations    More Lost Civilizations   Lost Lands

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More ATLANTIS stuff:
  R.Shand — A.Hefner — GreekTreasure — R.Shand — ActiveMind

Other places to explore:   Pan+OAHSPE - Eria - Antilla (Aiaia, Ogygia, Hespera, Anostos, Avalon.Island, Vlaenderen, Emperadada, Estotiland, Grocland, Frisland) - Numerica - Nulantis - Poseid - Holarctica - Pangaea - (Atlante.Island, Isle of Brazil or Bresil) - Xibalba - Ariana+planet) - Rutas+continent (Ruta, Daitya <-- Poseidonis) - Rapanui (<-- Mu --> Rutas) - Tiahuanaco+seaport - Cholula - Tartessos / Tarshish - Lake.Tritonia - Heligoland - Kalu'a+continent - Theytis.Ocean - Baalbek - Lyonesse+Cornwall - Ys+Brittany - Tir-nan-n'oge+Ireland - Nibiru+planet - Anunnaki - Nazca+Atacama+Mojave

Also cf.   Vinland Map - Mayan numbers - Tasaday - Ragnarok - Akkadian {Akashic?} - Mediterranean desert=Hell?, Orichalc / Orichalcum - Piri Re'is Map - Popul.Vuh - worldwide+pyramid+belt