Militant Islamist fighters take part in a military parade along the streets of Syria's northern Raqqa province June 30, 2014. The fighters held the parade to celebrate their declaration of an Islamic “caliphate” after the group captured territory in neighbouring Iraq, a monitoring service said. The Islamic State, an al Qaeda offshoot previously known as Islamic State in Iraq and the Levant (ISIL), posted pictures online on Sunday of people waving black flags from cars and holding guns in the air, the SITE monitoring service said. (Photo by Reuters/Stringer)

These pictures show a five-year-old boy who is already extremely comfortable around alligators. Blaise's dad T-Mike runs the Kliebert Gator Farm, the biggest and oldest in the world and which was started by his grandfather Harvey in 1957. Photo: T-Mike Kliebert and his son Blaise tackle Chinaman a 12 foot alligator in Hammond, Louisiana. (Photo by Barcroft Media)

These pictures show the beautiful ruins of abandoned temples. The incredible shots, taken at temples in Angkor, Cambodia, show the striking yet haunting temples as they crumble to ruins. While they may have lost some of their former glory, the stunning temples show the beauty of the Cambodian landscape through the historic architecture. Here: Sun rises over the 5 towers of Angkor. (Photo by Alex Teuscher/Caters News)

Normally, pictures can be worth a thousand words but these images of some horrifyingly brilliant face paint art will give you the shivers. The fascinating photographs will make your head spin and your stomach churn as the life-like illustrations leave you shocked. Nikki Shelley, 34, from Rugby in Warwickshire, has built a career out of face painting after she started practicing on her children. Here: The Devil inside by Nikki Shelley. (Photo by Nikki Shelley/Caters News)

A supercell that spawned a tornado earlier makes it was east north of McLean, Texas on April 16, 2015 in Texas, United States. Huge hail, terrifying lighting and giant supercells the size of buildings – these incredible images depict a year in the life of a storm chaser. Shot in 2015 by photographer Mike Olbinski, 40, this series of pictures show both the beautiful and the extreme nature of weather in the United States. (Photo by Mike Olbinski/Barcroft Media)

They might look like something straight out of a horror film, but these extraordinary images have been created to show the special bond between cats and their owners. Photographer Sebastian Magnani, 28, from Brig, Switzerland, took pictures of dogs and their owners using the same position and camera settings before working his magic with editing software. The result is this startling set of images, which show the pooches with human clothes – one wearing a hoodie, another with a red coat, one with a shirt and cardigan, and another with a blue jacket. (Photos by Sebastian Magnani)

A UFO enthusiast who found himself locked in the iconic Roswell museum has shared the pictures he took with aliens to pass the time. Chris Burton, from the U.K., had dreamed of visiting Roswell, N.M., since he was a child but was stunned when he found himself locked in the International UFO Museum and Research Center during a recent trip. The 42-year-old used the unique opportunity to get interactive with the usually out of bounds exhibits and set up some funny snaps with the extraterrestrials – posing for a beer with one alien and taking a nap with another. (Photo by Chris Burton/Caters News Agency)

The Spanish photographer Xavi Bou digitally combines sequential pictures of birds to create a single image, or chronophotograph, that reveals the shapes of their flight paths against Catalonian skies. His work shows the variety and beauty to be found in the daily activities of the local birds, including spiralling storks, swooping starlings and giddy swifts. Here: European herring gulls at Llobregat Delta. (Photo by Xavi Bou/Rex Features/Shutterstock)