Firefighters hold a demonstration by lighting themselves on fire in front of a regional government building to demand more work safety measures in Oviedo, Spain, Dec. 3, 2015.
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A volcanic lightning thunderstorm, a weather phenomenon that is related to the production of lightning in a volcanic plume, is seen from Mount Etna's Voragine crater, Dec. 3, 2015, in Catania, Italy.
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Cars are stuck in a flock of sheep being driven to another meadow near Bad Koetzting, Germany, Dec. 1, 2015.
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Michael Phelps, left, rests on a lane divider as other swimmers go past during a practice session for the U.S. Winter Nationals swimming event, Dec. 2, 2015, in Federal Way, Wash. Phelps will put a cap on his 2015 season at the event this week. It's his final opportunity to show just where his comeback is at before the Olympic year arrives.
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Two life-size Victorian style dolls shocked Londoners, as the creepy pair popped up at commuter hotspots across the capital to mark the launch of the world's first psychological theme park ride created by Derren Brown, coming to Thorpe Park Resort in 2016, Dec. 3, 2015. The dolls were spotted at numerous venues in London including Charing Cross Tube Station, Oxford Circus, Regents Street and Hamleys where they were seen playing with a toy train set, carrying dolls and pushing an empty 1900's style pram.
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New recruit People's Liberation Army soldiers stand in formation during a training session in cold winter temperatures at a military base in Heihe, China, Nov. 29, 2015.