One of his well-known, earlier works was removed by owners who didn't know it was a Bansky.

In 2011, one of Banksy's pieces Gorilla in a Pink Mask was painted over when the Eastville building it was painted on was about to go under construction to become a mosque. The building had formerly been a social club, and its new owners knew nothing about the work on the wall and had it removed.

fact via / image via (photographed by: Eddie Dangerous)