Devotees ride on the roof of a train as they return to the city after attending the final prayers on the first phase of Bishwa Ijtema in Dhaka January 11, 2015. Hundreds of thousands of pilgrims congregated in the Bangladeshi capital Dhaka as the first phase of this year's Bishwa Ijtema, one of the biggest Islamic gatherings in the world after the Haj in Saudi Arabia, came to an end. (Photo by Reuters/Stringer)

In this two photo combination picture, the Eiffel Tower with its usual lighting at left, and after the lighting was switched off at right, at the occasion of the Earth Hour, in Paris, France, Saturday March 28, 2015. This Saturday, 28 March 8:30 p.m. local time, individuals, businesses, cities and landmarks around the world are switching off their lights for one hour to focus attention on climate change. (Photo by Remy de la Mauviniere/AP Photo)

A solar-powered plane takes off from Jiangbei International Airport in southwest China's Chongqing Municipality, Tuesday, April 21, 2015. The Solar Impulse 2 departed Chongqing on Tuesday for a 1190-kilometer (642-mile) flight to the city of Nanjing in eastern China, the sixth leg of its around-the-world flight. (Photo by Chinatopix via AP Photo)

These breathtaking images capture the hidden depths of one of the worlds largest caves, which is so big its home to a beach, a river and a jungle. At more than 130m high, and 150m across, the imposing cave is so big as high as the London Eye and wider than one-and-a-half football pitches. Here: The campers set up inside the cave on the beach. (Photo by Lars Krux/Caters News)

Players perform during a game at the first Bubble Soccer tournament in Hitzkirch, near Lucerne, Switzerland, June 27, 2015. Bubble Soccer, also known as Zorb Soccer, is becoming increasingly popular around the world. The game is a recreation of playing soccer whilst encased in an inflated zorb which covers the players upper-body and head. (Photo by Urs Flueeler/EPA)

These are the explosive images of some of the world's most ASH-stonishing volcanic eruptions. Spectacular snaps capture lava spewing down the side of Kilauea, ash spitting from craters and plumes of smoke rising thousands of feet in the air. Russian non-profit AirPano travel the globe taking the breath-taking panoramic images, compiled in this series displaying their most stunning volcanic shoots. Included in the set – which spans four continents – are images from across the United States, Iceland, Russia, Ethiopia and Indonesia. To capture the 360-degree images, AirPano photographers spend around two hours in a helicopter, sending out drones to capture the action below. Here: Volcano Plosky Tolbachik, Kamchatcka, Russia. (Photo by Airpano/Caters News)

Globe-trotting photographer couple Peter Sedlacik and Zuzu Galova have found a fun way to document their travels around the world. Wherever they are, they face each other, frame up a great composition, and take a picture of each other… taking a picture of each other. Thus was born the photo series/project “Lens Between Us”, which is quickly scooping up followers on Tumblr, Facebook and Instagram alike. The resulting diptychs are creative, well-composed, and whimsical in the best way. A tribute to how their focus is always on each other, the images are part travel photography, part portraiture, and challenging to boot since each shot requires that they figure out not one, but two compositions. (Photo by Peter Sedlacik/Zuzu Galova)

Lowry Park Zoo elephants Matjeka, 23, and her 1-year-old daughter, Mavi, apply a liberal coating of “sunscreen” to themselves in a clay mud wallow at the park Tuesday, August 12, 2014, in Tampa, Fla., on the park's first observation of World Elephant Day to raise awareness of the wild African elephant crisis. “Elephants are prone to being sunburned”, said associate curator Chris Massaro. “What they need is lot of mud or clay to roll around in and cover up their skin so it will protect it from the sun”. (Photo by Cherie Diez/AP Photo/The Tampa Bay Times)