The Vatican has been striving to upgrade its measures to detect and discourage money laundering, hiring a Swiss expert just a few months ago. Last summer, the Holy See passed a key European financial transparency test but received failing grades for its financial watchdog agency and its bank, formally called the Institute for Religious Works.
The museums, with their entrance fees and popular souvenir shops, are a big money-maker for the Vatican. Other Vatican attractions, such as tours of the Vatican's ancient underground spaces, also charge admission.
Giulia Saudelli from Rome contributed.