madrid archaeologists spain unearth body mass grave date back 1936-1939 civil war ensue dictatorship general francisco franco include still wear rot leather boot dig local cemetery valladolid central spain come amid renew efforts volunteer associations victim campaign group shed light bloody past bring closure relatives still search family members four mass grave excavate valladolid 228 body recover since april 2016. grave believe among 2,000 mass burial sit think exist across spain civil war ideological struggle right leave 80 years ago historians estimate many 500,000 combatants civilians kill republican nationalist side war end tens thousands franco enemies kill imprison campaign wipe dissent hope forensic analysis find say julio del olmo one work exhumations local council valladolid partly finance excavation one examples date authorities back dig franco die 1975 spain pass amnesty law bid smooth transition dictatorship democracy pardon crimes fascist regime increase interest new generations face past lack accountability mean relatives never lay rest another similar smaller-scale dig also take place village huesca near zaragoza northern spain request man search great uncle two body find august 30 international day commemorate victims enforce disappearances spanish archaeologists dig civil war dead mass grave