Note: This calendar view maps the number of captures of http://unesdoc.unesco.org/ulis/cgi-bin/ulis.pl?database=ged&se_p=inc&se=Museum&req=2&by=3&sc1=1&look=museum&sc2=1&widen=1&lin=1&text=bulgaria&text_p=inc&submit=%A0%A0Go%A0%A0, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.