Searched for https://es.unesco.org/courier/2020-4/bronces-chinos-del-mundo-entero-reunidos-museo-virtual 
Note: This calendar view maps the number of captures of https://es.unesco.org/courier/2020-4/bronces-chinos-del-mundo-entero-reunidos-museo-virtual, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.