Numerous valuable pieces of art at Rai, Italy's public broadcaster. They include works by Claude Monet and Amedeo Modigliani, some of which were replaced by fakes; the missing art is valued at over €20 million. They believe they were targeted during a 1996 exhibition in Puglia.

https://www.rt.com/news/526484-rome-art-theft-monet-modigliani/