Wounded Indian soldiers are seen recuperating on the beach in Bournemouth in 1917, digitally altered against an image from 2014, also showing people walking along the same beach. (Photo by Peter Macdiarmid/Getty Images)

A picture showing office workers take a break outside the former Egypt House on July 11, 2014, has been digitally altered to show Australian soldiers outside the same building in 1917. (Photo by Peter Macdiarmid/Getty Images)

A superimposed image shows Injured soldiers of the British Army at the Brighton Pavilion, converted into a military hospital around 1915, with what the Music Room at the Royal Pavilion looked like earlier this month. (Photo by Peter Macdiarmid/Getty Images)

German prisoners of war during the First World War on their way to Southend Pier accompanied by guards and watched by the local populace in 1914, is seen against a backdrop of sunshine on the seafront on July 17, 2014. (Photo by Peter Macdiarmid/Getty Images)

British soldiers inspect a captured German place in the Horseguards' Parade, London during World War I in November 1914, with the London Eye in the background as a reminder of just how much has changed in the last 100 years. (Photo by Peter Macdiarmid/Getty Images)

Soldiers and nurses at Great Dixter, East Sussex, in 1916, sit at a table in the Great Hall at Great Dixter, with some still in bed. Great Dixter was turned into a convalescent home for soldiers in the 1st World War. (Photo by Peter Macdiarmid/Getty Images)

The familiar Albert Hall is seen in present day as a backdrop for wounded soldiers and cadets on Empire Day in May, 1918. (Photo by Peter Macdiarmid/Getty Images)

This digital composite image shows London, with Serbian soldiers marching in the Lord Mayor's show, in the last days of WWI, on 9th November 1918, juxtaposed with the capital in modern times. (Photo by Peter Macdiarmid/Getty Images)

American troops marching down Sloane Street, west London, during World War I, in 1918, digitally composed onto a picture of the iconic street from July. (Photo by Peter Macdiarmid/Getty Images)

A picture from 1916 shows soldiers playing football outside Blenheim Palace, superimposed with an image of visitors looking around the palace in 2014. (Photo by Peter Macdiarmid/Getty Images)

This shot shows a tank passing through the streets of London in November, 1917, and what it would resemble in present day. (Photo by Peter Macdiarmid/Getty Images)