The Sydney Skyline is seen before the lights are switched off for Earth Hour on March 26, 2011 in Sydney, Australia. Earth Hour encourages individuals around the world to turn off their lights for one hour at 20:30 local time on March 26, 2011 to take a stand against climate change. The largest Earth Hour was in 2010 when 128 countries participated.

A general view shows the wreckage of armed trucks on the streets of Budapest at the time of the uprising against the Soviet-supported Hungarian communist regime in 1956. The picture was taken in the period between October 23 and November 4, 1956. (Photo by Laszlo Almasi/Reuters)

A firefighter battling the King Fire watches as a backfire burns along Highway 50 in Fresh Pond, California September 16, 2014. The fire led officials to call on about 400 people to evacuate from areas threatened by the blaze, Cal Fire spokeswoman Alyssa Smith said. It has charred more than 11,500 acres (4,654 hectares) and was 5 percent contained on Tuesday. (Photo by Noah Berger/Reuters)

A General Atomics MQ-9 Reaper stands on the runway during “Black Dart”, a live-fly, live fire demonstration of 55 unmanned aerial vehicles, or drones, at Naval Base Ventura County Sea Range, Point Mugu, near Oxnard, California July 31, 2015. (Photo by Patrick T. Fallon/Reuters)

Award winning Italian Bodypainter Johannes Stötter, paints his models to blend in to their backgrounds. The artist and musician based in Italy has created some of the most unique and life-like pieces of art we've ever seen. And yes, while some works like the ready-to-eat human melon heads creep us out, it's fair to say Stötter has owned his craft. Photo: “Melon”. (Photo by Johannes Stötter)

A driver on the Horseshoe Pass in North Wales wiping the snow from the windscreen of his car during a heavy snow storm, 18th January 1937. (Photo by Norman Smith)

A man wearing a mask and dressed in a clown costume rides an electric tricycle while carrying a container in the shape of a rubber duck amid heavy smog in Beijing, China, December 29, 2015. (Photo by Jason Lee/Reuters)

Football transfers are not cheap. To have a player strengthen their ranks, teams are willing to pay big money. The football transfer considered to be the most expensive in the sport's history was that of Gareth Bale leaving Tottenham to play at Real Madrid. The Spanish club paid not less than £86 million (about $133 million at today's exchange rates) to have the player among its own. But recent news suggest that this record might be broken this year. According to reports in the media, UK Premier League team Manchester United is willing to almost double that amount.