Note: This calendar view maps the number of captures of http://www.unesco.org/new/en/communication-and-information/flagship-project-activities/memory-of-the-world/register/full-list-of-registered-heritage/registered-heritage-page-9/universalis-cosmographia-secundum-ptholomaei-traditionem-et-americi-vespucii-aliorumque-lustrationes/, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.