People walk inside the Ksiaz castle under which the 'Nazi gold train' is supposedly hidden underground, on August 28, 2015 in Walbrzych, Poland. Poland's deputy culture minister on Friday said he was 99 percent sure of the existence of the alleged Nazi train that has set off a gold rush in the country. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)

People walk inside the Ksiaz castle under which the 'Nazi gold train' is supposedly hidden underground, on August 28, 2015 in Walbrzych, Poland. Poland's deputy culture minister on Friday said he was 99 percent sure of the existence of the alleged Nazi train that has set off a gold rush in the country. AFP PHOTO / JANEK SKARZYNSKI        (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)