Nazi dictator Adolf Hitler greets supporters at a May Day gathering in the Olympic Stadium, Berlin. (Photo by Keystone). 1st May 1938

Afghanistan, published by Taschen later July, is a retrospective portfolio of the Magnum photographer Steve McCurry’s most striking images of the country, from 1979 to 2016. Here: Kunar province, 1980. Armed mujahideen carry animal skins to use as inflatable buoys to cross rapids. (Photo by Steve McCurry/Taschen/Magnum Photos/The Guardian)

David Bowie, 1974. David Bowie's quirky character and style was perfectly encapsulated in this shot by Terry O'Neill, which shows the music legend posing next to a barking dog on the artwork for his 1974 album “Diamond Dogs” in London. (Photo by Terry O'Neill)

A musher races with his dogs during a sled dog European Championship in Venek November 22, 2014. (Photo by Laszlo Balogh/Reuters)

The jewelled flower mantis, commonly found in Asia, is believed to be the inspiration for many martial artists is seen in Jakarta, Indonesia on August 2, 2016. (Photo by Prabu Dennaga/Barcroft Images)

Iain Blake is an amateur photographer that has gained his popularity on the Internet thanks to his photoset of “Stone Footprints”. By finding the right stones and perfectly arranging them, Iain was able to make a number of very appealing pictures. For some reason, these “footprints” look adorable. It could have something to do with the cartoony appearance that they have. In our opinion, the finest photo out of this whole set is the one with a large footprint and a smaller one on top of it, as if a child has stepped into the footprint left by his or her parent. (Photo by Iain Blake)

“Hippo Chase”. As we approached the camp the Selinda Reserve of northern Botswana our boat passed by a hippo resting in the water. I turned around to look back at the boat's wake and saw the hippo charging after us! The hippo must've been tired from an all-nighter because he was angry. He rose way up out of the water three times trying to chase our boat! He was coming at us with such force that he created a wake of his own. Photo location: Selinda Reserve of northern Botswana. (Photo and caption by Curtis Simmons/National Geographic Photo Contest)