Wave your red flag and get ready to run: it's time for the famous Pamplona encierro! Also known as The Running of the Bulls, it's the highest profile event of the San Fermin festival, held yearly in Pampalona, Spain. While there's no proof as to when the tradition started, Spanish tradition says the true origin of the run began in northeastern Spain during the early 14th century.
The first bull run begins July 7, and one is held each morning of the festival at 8 a.m. To prepare for the event, the streets are lined with barricades to help direct the bulls to their final destination. Attendees typically wear white shirts and pants and a red waistband and neckerchief to show their solidarity.
While the bull run has long been a tradition in Spain, it's openly protested against by many animal activist groups, the most notable being the "Running of the Nudes" event, which is supported by PETA and other groups that object to the celebration.