Vilnius Cathedral is in Vilnius, the capital city of Lithuania, an eastern European country bordering the Baltic Sea, Belarus ...

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.

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 ...

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 ...

The insignia were found wrapped in newspaper from 1939. Credit: Archdiocese of Vilnius. Celebrations of the discovery were tinged by controversy regarding the authorship of discovery.

The Vilnius Cathedral crypt contains the tombs of King Alexander Jagiellon and of Queens Elizabeth of Austria and Barbara Radziwiłłówna. The heart of King Władysław IV Vasa was also placed here.

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.