Video. Up Helly Aa: A fiery celebration of Shetland's Norse HeritageThe Up Helly Aa festival celebrates Shetland's Viking heritage with a vibrant tradition of processions and culminates in the burning of a Viking galley.
IN IMAGES: Spain's devilishly explosive correfoc celebrationsCorrefoc is a fiery street celebration featuring participants dressed as demons, creating a spectacular display of fireworks and revelry throughout regions in Spain.