Megaliths.org and Newearth Youtube channel
This website gives you a really good idea about lost history and what remains to tell us about it. We have a lost recent past as well as only being able to rely somewhat on myths and legends as to before that.
The megaliths website is not the most modern or stylish but does contain a llarge number of very interesting images. You can also navigate to the videos by Sylvie Ivanova on youtube from there
The new chronology
This website, although again not slick is an incredible reource for finding why we don't know our true history and origins. The authors draw no conclusions for you (That will depend on how much you know already).
Please start and continue from the link given below before you look at the rest of he site. DO NOT READ ANY SUMMARIES UNTIL YOU READ THE DETAILED (SOMETIMES BORING) RESEARCH.