Explosives and mines from WWI and WWII still turn up on European and Asian construction sites, backyard gardens, beaches, wildlife preserves and former military training ground. For most countries, these discoveries are not isolated incidents but are the result of hastily cleared ammunition dumps, training ground, bombings and mine fields from these wars. In the United Kingdom, over 20 percent of the entire landmass has, at one time, been used for military training. This military training has resulted in uncovered ordnance that dates from cannon and musket balls to modern weapons. Many of the older U.K. ranges can contain an entire historic sampling of ordnance. Clearance of these areas is a priority because it is being returned to private ownership and must be confirmed "free of ordnance" under current laws.
Busé, Margaret S.
"WWII Ordnance Still Haunts Europe and the Asia-Pacific Rim,"
Journal of Conventional Weapons Destruction: Vol. 4
, Article 23.
Available at: http://commons.lib.jmu.edu/cisr-journal/vol4/iss2/23