Three thieves forcibly entered the Royal Palace of Venaria Reale near Turin and stole 26 pocket watches from the 18th century, with a total value estimated at around 150,000 euros, according to Italian media.
The attack took place during the night between Sunday and Monday, Ilsole24ore reported.
The Royal Palace of Venaria Reale is one of the historic residences of the House of Savoy and is located a few kilometers from Turin.
Since 1997, it has been on the UNESCO World Heritage List.