Antique tarot decks are historically significant card sets, typically over 100 years old, collected for their artistry, rarity, and cultural importance. Key examples include the 15th-century Visconti-Sforza, the 18th-century Tarot de Marseille, and the 1909 Rider-Waite-Smith. Their value, ranging from hundreds to tens of thousands of dollars, is determined by age, condition, completeness, and the significance of the publisher or artist.