Leftover ordnance is one of the legacies that lasts generations after the war itself concluded. The phrase “Iron Harvest” comes from the annual crop of exploded shells and bombs that French farmers in northern France bring to the surface when plowing their fields. Farming is a dangerous occupation in France.

But the Iron Harvest is not limited to World War I. World War II era bombs are sometimes found, particularly in areas heavily bombed during that conflict. The city center of Rennes was evacuated within the last few years when a 550 lb British bomb was discovered and had to be disarmed. A similar discovery required the evacuation of the Paris suburb of Boulogne-Billancourt

Nor is the ordnance always found in an active war zone. Recently, in Washington, DC, a construction crew building a new supermarket was somewhat surprised to discover an unexploded 1,000 pound bomb. The supermarket was being built on the site of the old Naval Gun Factory, a site that apparently the Navy had not cleaned up quite as well as they might have.

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Even better? The Army has still not quite been able to figure out where all the old chemical weapons dumps underneath DC are, including some in heavily populated areas, one of which was nicknamed “Hades”:

[The] corps excavated part of the South Korean ambassador’s residence on Glenbrook Road. They discovered two pits on the ambassador’s property and then a third straddling the property line to the north, all of which contained munitions and glassware with traces of chemical agents.

Perhaps the most damaging form of unexploded ordnance, however, are the cluster bomb remnants and landmines that litter more recent battlefields, from Afghanistan to Vietnam to Korea. Just looking at landmines:

There are between 70 and 80 million landmines in the ground in one-third of the world’s nations. Landmines are indiscriminate weapons that maim or kill 15,000 to 20,000 civilians every year. They cost as little as $3 to produce, but as much as $1000 to remove.

At $1000/mine, that works out to $80 billion to remove all the mines, and that assumes that all the mines can be found. If northern France is any indication, they won’t be , and the legacy, as it has for the French, will be generational, the continuing toll of a fading war.