The ancient Romans definitely had a habit of hiding their most prized possessions. To date, more than 17,000 coin hoards have been unearthed in Europe, North Africa, and parts of Asia, along with other stunning treasures.

Just this month, a trove of 3,000 ancient coins and gems was discovered in northern Italy near modern-day Bologna. Archaeologists have only explored 10% of the "magical place" so far, meaning many more treasures could soon be discovered. Although these latest finds have yet to be valued, Roman hoards can sell for mind-blowing sums, as the following examples show. Read on for 15 of the most valuable Roman hauls of all time. All dollar amounts in US dollars.