Queen Elizabeth II and her husband, Prince Philip, view the art installation "Blood Swept Lands and Seas of Red" at the Tower of London on October 16, 2014. (Photo by Max Mumby/Indigo/Getty Images
The Historic Royal Palaces website explains the symbolism of the installation, which marks the 100th anniversary of Britain's involvement in the First World War:
Created by ceramic artist Paul Cummins, with setting by stage designer Tom Piper, 888,246 ceramic poppies will progressively fill the Tower's famous moat over the summer. Each poppy represents a British military fatality during the war.
Below: Queen Elizabeth visits the crypt of Sir Thomas More in the Chapel of St Peter ad Vincula at the Tower of London. (Photo by Chris Jackson – WPA Pool /Getty Images)