The "visa" is just a big stamp in your passport. Nationals of the following countries do NOT require visas to visit Argentina for tourism or family visit for a period not exceeding 90 days or for transit:
United States of America, Andorra, Australia, Austria, Barbados, Belgium, Bolivia, Brazil, Bulgaria, Canada, Chile, Colombia, Costa Rica, Croatia, Cyprus, Czech Republic, Denmark, Dominican Republic, Ecuador, El Salvador, Estonia, Finland, France, Germany, Greece, Guatemala, Guyana, Haiti, Holy See, Honduras, Hong Kong S.A.R., Hungary, Iceland, Ireland, Israel, Italy, Japan, Korea, Liechtenstein, Lithuania, Latvia, Luxembourg, Macedonia, Malta, Mexico, Monaco, the Netherlands, New Zealand, Nicaragua, Norway, Panama, Paraguay, Peru, Poland, Portugal, Romania, Saint Kitts and Nevis, Saint Lucia, San Marino, Saint Vincent and the Grenadines, Serbia, Singapore, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Thailand, Trinidad and Tobago, Turkey, United Kingdom of Great Britain and Northern Ireland, Uruguay and Venezuela.