Note: This calendar view maps the number of captures of http://portal.unesco.org/unesco/ev.php?URL_ID=13653&URL_DO=DO_EMAIL_FRIEND&URL_SECTION=-471&reload=1521756052&EXIT_URL_ID=13653&EXIT_URL_DO=DO_TOPIC&EXIT_URL_SECTION=-471, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.