When Trajan conquered Dacia in AD 106 he took a hoard of gold so vast that ancient sources put it in the hundreds of tonnes, and it funded a hundred and twenty days of games in Rome. It came from the Apuseni Mountains of what is now Romania, where the Romans drove galleries at Rosia Montana, the best-preserved Roman gold mine in the world and still fought over by modern mining proposals. The Dacian gold bracelets looted from Sarmizegetusa and recovered in the 2000s are extraordinary.
Rosia Montana & the Apuseni (Romania)
See it on the map