Vitali Klitschko and some Fans attends on the red carpet of the “Klitschko” Premiere on June 14, 2011 at Lichtburg in Essen, Germany. (Photo by Mathis Wienand/Getty Images)

Renaud Lavillenie of France in action while competing in the Mens Pole Vault during the Air Show “Berlin fliegt!” at Brandenburger Tor on August 12, 2011 in Berlin, Germany. (Photo by Joern Pollex/Bongarts/Getty Images)

Vietnam’s Son Doong cave, the largest in the world, could hold a 40-story skyscraper inside. The pristine ecosystem has its own river and jungle. Despite its size, Son Doong wasn’t discovered until 1991. It was lost again for nearly two decades and was fully explored for the first time in 2009. (Photo by Jason Speth/HuffPost)

Newborn sea lion “Kaya” crawls at the enclosure at the zoo in Wuppertal, Germany July 23, 2015. Kaya was born on July 4, 2015 in the zoo, officials said. (Photo by Ina Fassbender/Reuters)

Over the years a large population of grey herons have made an unlikely home in urban Amsterdam. Julie Hrudova documents how the birds integrate into city life. Here: Hundreds of herons come to the city during winter to find food and shelter. (Photo by by Julie Hrudova/The Guardian)

A Libyan rebel fires on a government jet as a natural gas facility burns on the frontline on March 9, 2011 near Ras Lanuf, Libya. The rebels pushed back government troops loyal to Libyan leader Muammar Gaddafi towards Ben Jawat.

Lizzy Cundy attends the UK premiere of The Eagle held at The Empire Leicester Square on March 9, 2011 in London, England.

Dinara Safina of Russia hits a backhand in her match against Arantxa Parra Santonja of Spain during the BNP Paribas Open at the Indian Wells Tennis Garden on March 10, 2011 in Indian Wells, California.