A New York window cleaner strapped to the side of The RCA Building in the Rockefeller Center, with St Patrick's Cathedral below him to the left. (Photo by William Lovelace/Express/Getty Images). 2nd May 1961

Space Shuttle Atlantis lands at the Kennedy Space Center July 21, 2011 in Cape Canaveral, Florida. The landing brings to a close the 30-year era of the space shuttle program that began in 1981, and has included 135 missions. (Photo by Bill Ingalls/NASA via Getty Images)

An Aerial view Admiralty Arch at the top of The Mall on July 26, 2011 in London, England. (Photo by Tom Shaw/Getty Images)

An animatronic dragon performs during the launch of How To Train Your Dragon Arena Spectacular at a Dreamworks and Global Creatures media call on August 8, 2011 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

Racing in the XOD class during day six of the Aberdeen Asset Management Cowes Week on August 11, 2011 in Cowes, England. (Photo by Alan Crowhurst/Getty Images)

Actress Athene Seyler attempts to contort her body, in a scene from the show, “Skin Deep”. (Photo by Sasha/Getty Images). Circa 1928

Singer Selena Gomez performs at the PNC Bank Arts Center on August 20, 2011 in Holmdel, New Jersey. (Photo by Michael Loccisano/Getty Images)

Protestors disperse color paint during a protest against the government, at central square, during an anti-government protest in Skopje on June 6, 2016, in a series of protests dubbed Colourful Revolution. Macedonia's president on June 6, 2016 said he was revoking all the controversial pardons he had granted in April to dozens of people implicated in a huge wiretapping scandal. President Gjorge Ivanov had on April 12 said he was halting probes into 56 Macedonians suspected of involvement in the scandal – a surprise decision that sparked international condemnation and angry street protests. (Photo by Robert Atanasovski/AFP Photo)