http://www.king-tut.org.uk/ancient-egypt/the-great-sphinx.htm (multicultural relationship)
http://www.jstor.org/pss/25111264 (importance in education)
http://tvtropes.org/pmwiki/pmwiki.php/Main/RiddleOfTheSphinx (humor and relationship to modern culture)
These are just a few websites that I found interesting. Remember to comment about SIGNIFICANCE and to POST your own riddle/guess the answer to the riddles of your classmates:) I hope this is fun and interesting for you