An unexploded shell is outlined with tape during a clearance...

FREEDOM PARK, PRIZREN, DISTRICT OF PRIZREN, SERBIA AND MONTENEGRO - 2015/08/10: An unexploded shell is outlined with tape during a clearance operation by the Kosovo Security Force (KSF) Emergency Ordinance Disposal (EOD) team in Freedom Park near Prizren, southern Kosovo. Kosovo was contaminated by land mines and cluster munitions during the conflict between Yugoslav forces and the Kosovo Liberation Army in the late 1990s. In 1999 NATO bombed Yugoslav targets in Kosovo over 78 days, releasing 1,392 bombs containing 295,700 sub-munitions. With a failure rate estimated at 20%, tens of thousands of these unexploded sub-munitions littered the ground or became buried in fields and gardens. (Photo by Edward Crawford/SOPA Images/LightRocket via Getty Images)