The Sanfermines festival is a week-long celebration held each July in Pamplona, Spain in honor of Saint Fermin. The most famous event is the running of the bulls, where participants run in front of bulls leading them to the bullfighting ring. Ernest Hemingway first visited in 1923 and was impressed by the atmosphere and bullfighting, featuring it prominently in his novel "The Sun Also Rises". After the book was published, tourism to the festival increased greatly. Today, places Hemingway frequented like cafes and hotels can be visited on tours, maintaining his legacy of bringing fame to the festival.