Underground galleries, part of Nazi Germany &quot;Riese&quot; construction project are pictured under the Ksiaz castle in the area where the &quot;Nazi gold train&quot; is supposedly hidden underground, on August 28, 2015 in Walbrzych, Poland. Poland&#39;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)