Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...

Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...

The cache from Vilnius Cathedral, in Lithuania, has not been seen since the outbreak of World War II in 1939, according to a press release from Go Vilnius tourism promotion agency on Wednesday.

According to the Vilnius Cathedral, the set of regalia was first discovered in its basement in 1931, when a flood revealed the burial chambers of the Grand Duke of Lithuania and King of Poland.

Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...

Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...

Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...

Cathedral officials in Lithuania spent decades searching for 450-year-old royal treasures hidden before WWII. Photos show the long-lost finds. Photo from the Vilnius Archdiocese / Aistė Karpytė ...