Latvian Riflemen Monument, Soviet statue commemorating fighters in the First World War, in square bearing its name, Riga, Latvia, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Stained glass depicting victims of the First World War, Semur-en-Auxois, Cote d'Or, Burgundy, France, Europe

Monte Piana open-air First World War Museum, Tre Cime di Lavaredo, Belluno, Bozen, Dolomites, Italy, Europe

Stained glass window of First World War veterans praying, Mont-Dol chapel, Mont-Dol, Ille-et-Vilaine, Brittany, France, Europe

Aerial of the 1st World War Memorial, Isle of Lewis, Outer Hebrides, Scotland, United Kingdom, Europe

First World War rock tunnels on Mount Lagazuoi with Pelmo and Nuvolau peaks on background, aerial view, Natural Park of the Ampezzo Dolomites, Veneto, Italy, Europe

Rows of white marble headstones in the Meuse-Argonne American Military cemetery for the First World War battle of Verdun, Romagne-Gesnes, Meuse, France, Europe

French commemoration of the Armistice Day November 11 1918, end of the First World War, the Renaissance of St. Gervais Marching band, Haute-Savoie, France, Europe

First World War memorial, Andrassy ut, Budapest, Hungary, Europe

First World War British Cemetery, Valley of the Somme near Mons, Nord-Picardie, France, Europe

Tower of London, Installation Blood Swept Lands and Seas of Red, World War I memorial, City of London, London, England, United Kingdom, Europe

Blood Swept Lands and Seas of Red installation at The Tower of London marking 100 years since the First World War, Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Blood Swept Lands and Seas of Red installation at The Tower of London marking 100 years since the First World War, London, England, United Kingdom, Europe

Ceramic poppies forming the installation Blood Swept Lands and Seas of Red to remember the Dead of the First World War, Tower of London, London, England, United Kingdom, Europe

Cemetery of Douaumont and the ossuary, Ossuaire de Douaumont, at Fleury-devant-Douaumont near Verdun, Meuse, Lorraine, France, Europe

Blood Swept Lands and Seas of Red installation at The Tower of London marking 100 years since the First World War, London, England, United Kingdom, Europe

Ceramic poppies forming the installation Blood Swept Lands and Seas of Red to remember the Dead of the First World War, Tower of London at dusk, London, England, United Kingdom, Europe

World War One Monument to the Sons of Verdun in Verdun, Meuse, Lorraine, France, Europe

World War I and World War II memorial La Ville de Pau for dead soldiers of two World Wars with floral tributes at Pau, Pyrenees, France, Europe

First World War Vimy Canadian Memorial, near Lens, Nord Pas de Calais, Nord-Picardiy, France, Europe

Shadows of people viewing Blood Swept Lands and Seas of Red installation at The Tower of London marking 100 years since the First World War, London, England, United Kingdom, Europe

The Ataturk message, Anzac Cove Cemetery, near Gallipoli, Turkey, Europe

World War One Monument to the Sons of Verdun in Verdun, Meuse, Lorraine, France, Europe

World War I Memorial, Lilongwe, Malawi, Africa

MacLellan's Castle and World War I monument, Kirkcudbright, Dumfries and Galloway, Scotland, United Kingdom, Europe

War graves near Anzac Cove, Gallipoli, Turkey, Europe

World War I memorial in Lille, Nord, France, Europe

First World War Vimy Canadian Memorial, near Lens, Nord Pas de Calais, Nord-Picardiy, France, Europe

Cemetery of Douaumont and the ossuary, Ossuaire de Douaumont, at Fleury-devant-Douaumont near Verdun, Meuse, Lorraine,France, Europe

Unknown soldier's grave under the Arc de Triomphe, Paris, France, Europe

1914 Battle of the Falklands Memorial in Port Stanley, Falkland Islands (Islas Malvinas), South America

Man visiting the Cemetery of Douaumont (Ossuaire de Douaumont) at Fleury-devant-Douaumont near Verdun, Meuse, Lorraine, France, Europe

Alhondiga de Granaditas, former granary, site of first major rebel victory of the War of Independence, now a museum, Guanajuato, UNESCO World Heritage Site, Guanajuato State, Mexico, North America

Guards at the Australian War Memorial, Canberra, Australian Capital Territory, Australia, Pacific

First World War Memorial above the city centre and Vila Bay, Efate Island, Port Vila, Vanuatu

Hand's Well, Well Dressing commemorating the First World War, Tissington, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Hand's Well, Well Dressing commemorating the First World War, Tissington, Peak District National Park, Derbyshire, England, United Kingdom, Europe

The Remains of the Godwin battery on the beach at Kilnsea at the head of Spurn point on Yorkshires East Coast, UK. Initially constructed during the First World War, the Godwin Battery was added to during the Second World War. It comprised of gun emplacements, search light, barracks, officers’ mess, and a hospital. This section of coastline is the fastest eroding coastline in Europe. The soft boulder clay cliffs are easily eroded and have been eroding since Roman Times, but recently the climate change impacts of increased stormy weather, increased heavy rainfall events and sea level rise have accelerated the rate of erosion. The average rate of attrition is 1.5metres per year, last year it was 5 metres.

The Remains of the Godwin battery on the beach at Kilnsea at the head of Spurn point on Yorkshires East Coast, UK. Initially constructed during the First World War, the Godwin Battery was added to during the Second World War. It comprised of gun emplacements, search light, barracks, officers’ mess, and a hospital. This section of coastline is the fastest eroding coastline in Europe. The soft boulder clay cliffs are easily eroded and have been eroding since Roman Times, but recently the climate change impacts of increased stormy weather, increased heavy rainfall events and sea level rise have accelerated the rate of erosion. The average rate of attrition is 1.5metres per year, last year it was 5 metres.

World War I Museum, Liberty Memorial, Kansas City, Missouri, United States of America, North America

Plaque marking the spot from where Gavrilo Princip assassinated Archduke Franz Ferdinand in Sarajevo on 28 June 1914, Sarajevo, Bosnia and Herzegovina, Europe

World War I Museum, Liberty Memorial, Kansas City, Missouri, United States of America, North America

War memorial on Monte Piana, Dolomites

Siemens memorial, bronze eagle with stele to commemorate the fallen employees of Siemens in the First and Second World War, outside the Siemens building, Berlin, Germany, Europe

War memorial on Monte Piana, Dolomites

Siemens memorial, bronze eagle with stele to commemorate the fallen employees of Siemens in the First and Second World War, in front of the Siemens building, Berlin, Germany, Europe

Siemens memorial, bronze eagle with stele to commemorate the fallen employees of Siemens in the First and Second World War, outside the Siemens building, Berlin, Germany, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

Pumps in Maginot Line concrete bunker in France, Europe

Ulster tower, British First World War Cemetery, Pas-de-Calais, Somme valley, France, Europe

First World War Cemetery at Soissons, Picardie, Aisne, Somme valley, France, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

La Targette, British First World War Cemetery, Pas-de-Calais, Somme valley, France, Europe

La Targette, British First World War Cemetery, Pas-de-Calais, Somme valley, France, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

Memorial to the fallen of the First World War, 1914-1918, built by the Nazis in 1934, Marbach, birth place of the classical poet and dramatist, Friedrich Schiller, Baden-Wuerttemberg, Germany, Europe

La Targette, British first World War cemetery, Pas-de-Calais, Somme valley, France, Europe

Thiepval First World War Cemetery, Picardie, Somme valley, France, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

First World War Cemetery and Memorial at Notre Dame de Lorette, Pas-de-Calais, Somme valley, France, Europe

War memorial to the fallen of the 1st World War at the Place de la Liberte, medieval old town of Domfront, Domfront en Poiraie, department of Orne, Normandy region, France, Europe

State Historical Museum, former Lenin Museum, First World War evocation, Bishkek, Kyrgystan

Vimy, Canadian First World War Memorial, Pas-de-Calais, Somme valley, France, Europe

strada delle 52 gallerie, pasubio mountain, italy

Emplacements of the Austrian forces during World War 1 at Mount Lagazuoi in the Dolomites, now preserved as a museum. The peakds of the Tofane in the background. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy, october

Emplacements of the Austrian forces during World War 1 at Mount Lagazuoi in the Dolomites, now preserved as a museum. The peaks of the Tofane in the background. The Dolomites are listed as UNESCO World heritage. europe, central europe, italy, october

Close-up of gold statue on top of the Monument of Remembrance against blue sky, Luxembourg City, Luxembourg

World War One memorial of a soldier with rifle and poppy; Wark, Northumberland, England

World War One war memorial at Chollerton Parish; Chollerton, Northumberland, England

World War One war memorial at Chollerton Parish; Chollerton, Northumberland, England

Bench as a war memorial (1918 - 2018) commemorating one hundred years, Chollerton Parish; Chollerton, Northumberland, England

War graves at the Thiepval Memorial to the Missing of the Somme, designed by Sir Edwin Lutyens, Thiepval, Somme, France

Le Quesnel Canadian Battlefield Memorial, France

First World War Memorial, Charlottetown, Prince Edward Island

White marble cross where American soldiers are buried, first American military cemetery of World War II, Colleville-sur-Mer, Calvados, Normandy, France