Every map has ancient and natural wonders that will boost your faction. Every map also has Atlantis hidden somewhere in the ocean. Finding it will provide finished technology free of charge. It can only be found with an open-water sea vessel (for example, a Galleon). Focus on naval technology so this can be done, as well as get a benefit over enemies that are more land-oriented; many other wonders are located on islands. Use Galleons or the Lighthouse of Alexandria to reach them.