Justine Shapiro and her fellow travelers explore the world, looking for the best festivals for each season in this installment of the popular travel show. Highlights include Mardi Gras in New Orleans; Ethiopia's Epiphany celebration; the Rio de Janeiro Carnival; Peru's Inca Inti Raymi festival; a journey on the Pilgrim Trail leading to Santiago de Compostella; and Pakistan's Ashura parade, commemorating the death of Muhammad's last descendent.