Men rest after salvaging metal on the 30th floor of the “Tower of David” skyscraper in Caracas February 3, 2014. A 45-storey skyscraper in the center of Venezuela's capital Caracas is a slum, probably the highest in the world. Dubbed the “Tower of David”, the building was intended to be a shining new financial center but was abandoned around 1994 after the death of its developer – banker and horse-breeder David Brillembourg – and the collapse of the financial sector. (Photo by Jorge Silva/Reuters)

A female soccer player controls a ball during a training session at the Golab Trust Sport Complex in Kabul March 10, 2014. Despite decades of conflict in Afghanistan, and several recent militant attacks, the country's capital Kabul is home to a vibrant youth scene of musicians, artists, athletes and activists. Shopping malls and cafes stand in the city, which is nonetheless beset by infrastructure problems and instability. (Photo by Morteza Nikoubazl/Reuters)

Wolfgang (L), member of World War One historical association “Darstellungsgruppe Suddeutsches Militar 1870-1918” (DSM 18), from Munich, Germany, and Florent, member of French association “Le Poilu de la Marne”, dressed in vintage army uniforms, visit the Bezonvaux bunker in the national forest of Verdun, eastern France, March 29, 2014. Members of French and German historical associations, who gather annually, together visited the battlefield of Verdun in France, the site of a bloody World War One battle that dragged on for around 10 months in 1916, claiming hundreds of thousands of lives and destroying many villages. (Photo by Charles Platiau/Reuters)

Three pugs peer out from a car window in Los Angeles, California. A wacky photographer has come up with an unusual pet project – snapping ecstatic dogs as they hang their heads out of car windows. Lara Jo Regan, 48, embarked on the odd task for her new 2014 calendar “Dogs In Cars”. The unusual shoot, which took place in Los Angeles, California, aimed to explore the joy experienced by pugs and huskies when a breeze hits their faces. (Photo by Lara Jo Regan/Barcroft Media)

The Ivanpah Solar Electric Generating System is seen in an aerial view on February 20, 2014 in the Mojave Desert in California near Primm, Nevada. The largest solar thermal power-tower system in the world, owned by NRG Energy, Google and BrightSource Energy, opened last week in the Ivanpah Dry Lake and uses 347,000 computer-controlled mirrors to focus sunlight onto boilers on top of three 459-foot towers, where water is heated to produce steam to power turbines providing power to more than 140,000 California homes. (Photo by Ethan Miller/Getty Images)

Painted eggshell displayed at Wayan Sadra's workshop on April 14, 2014 in Sukawati, Gianyar, Bali, Indonesia. 50-year-old Wayan Sadra got the idea to start his eggshell painting business, after his niece who worked in a five star hotel asked for his help to paint on an egg for an Easter egg competition. Now the business he started in 1997 attracts customers for his painted eggs from Germany, France, Italy, and the Netherlands. Sadra usually experiences a surge in sales ahead of Easter. (Photo by Putu Sayoga/Getty Images)

A nurse helps an injured bomb victim sitting at the back of a pickup truck at the Asokoro General Hospital in Abuja, April 14, 2014. A morning rush-hour bomb killed at least 35 people at a Nigerian bus station near the capital on Monday, raising concerns about the spread of an Islamist insurgency after the first such attack on Abuja for two years. Suspicion fell on Boko Haram, though there was no immediate claim of responsibility from the Islamist group mainly active in the northeast. Five hours after the blast, officials had given no death toll. Reuters journalists counted at least 35 bodies. (Photo by Afolabi Sotunde/Reuters)

Artist Rachel Stubbs works on the final touches of a sand sculpture she has built as part of this year's “Once Upon a Time” themed annual Weston-super-Mare Sand Sculpture festival on April 16, 2014 in Weston-Super-Mare, England. Due to open on Good Friday, a team of award winning sand sculptors from across the globe have been working to create sand sculptures influenced by fairy tales and fables but that also include some current television and cinema blockbuster hits such as The Hunger Games, Game of Thrones and The Hobbit. (Photo by Matt Cardy/Getty Images)