As India marks World Polio Day, it reflects on the successes and challenges it faced in becoming polio-free. After being declared polio-free in 2014, recent detection of Type 2 polio vaccine virus serves as a reminder of the importance of continued vigilance and surveillance. With Pakistan being the only South Asian country still fighting polio, India's journey towards elimination serves as an inspiration for the rest of the region. From making polio vaccination mandatory for travelers to implementing robust surveillance systems, here are five amazing facts about India's journey to becoming polio-free.