
A plate with gold decoration on display pictured during a private exhibition at the National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV

A gold mask on display pictured during a private exhibition at the National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV

Photographers take pictures of a silver vessel with gold decoration on display pictured during a private exhibition at the National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV

A silver vessel with gold decoration on display pictured during a private exhibition at National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV

A silver vessel with gold decoration on display pictured during a private exhibition at National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV

A photographer take picture of a golden ram vessel on display during a private exhibition at the National History Museum in Sofia, Bulgaria, 21 March 2011. Nearly 200 gold, silver, bronze and pottery items dating from between the 6th century BC to 1st century BC were shown in the exhibition 'Thrace and Ancient World' which is a collection of Bulgarian businessman Vassil Bozhkov EPA/VASSIL DONEV