The United Kingdom's Unknown Warrior, much like the United States' Unknown Soldier, arose from a movement to honor the unknown war dead who perished on the battlefields of World War I. When he was laid to rest in Westminster Abbey, he was surrounded by a throng of women whose only uniting thread was that they had lost their husbands and all their sons in the Great War.
When the British Empire decided to bury its war dead with France, the Commissioner for the Imperial War Graves encountered a shoddy battlefield grave. On its hastily-constructed wooden cross were just the words, "An Unknown British Soldier," crudely written in pencil. The Commissioner took it upon himself to take the matter of unknown war dead first to the Prime Minister and later, King George V himself. He wanted to create a national memorial to the scores of unknown war dead killed in the service of their country.
As the Empire's new Tomb of the Unknown Warrior was born, other countries began to honor their unknown dead with symbolic tombs of their own. France followed suit, as did the United States, and a number of other countries. In England, the Unknown Warrior was buried in one of the most revered places in British history.
Westminster Abbey is more than just a church, it is the burial site of more than 3,300 famous Britishers – from Prime Minister and Royals to artists and scientists – and has been the site of every coronation for the English throne since William the Conqueror captured the country in 1066. It also houses hundreds of priceless works of art and historical documents.
It is truly "Britain's Valhalla."
The Abbey also houses Britain's Tomb of the Unknown Warrior, who was entombed here on Nov. 20, 1920, at the same time as his French counterpart was entombed at the Arc de Triomphe in Paris. After being chosen from four possible Unknown Warrior candidates, the current Unknown Warrior was guarded by the French 8th Infantry throughout the night. King George chose a Medieval Crusader sword to affix to the lid of the specially-made casket, along with an iron shield bearing the words: "A British Warrior who fell in the Great War 1914–1918 for King and Country."
The next day, a military procession a mile long escorted the warrior to the harbor, where it was loaded aboard the HMS Verdun and set sail for London.
"Burial of The Unknown Warrior in Westminster Abbey." 1920.
After landing at Dover, the remains were carried by rail to London, where its new, British military parade received a Field Marshal's salute in front of an otherwise silent crowd. Eventually, the funeral procession was met by the King at Whitehall, who, along with the Royal Family and other government ministers, walked with the procession to Westminster. There, it was protected by an honor guard of 100 Victoria Cross recipients. After a ceremony, the body was interred in the floors and covered with a black marble slab.
To this day, it's the only part of the floor visitors cannot walk over.