The 'Boca di Leone' (Lion's Mouth), a secret anonymous letterbox used by Venetians for denouncing tax evaders, Doge's Palace, Venice, Italy, Europe.

- Image ID: T6350H

The 'Boca di Leone' (Lion's Mouth), a secret anonymous letterbox used by Venetians for denouncing tax evaders, Doge's Palace, Venice, Italy, Europe.

Ian Layzell / Alamy Stock Photo

Image ID: T6350H

Location: Doge's Palace, San Marco, Venice, Italy, Europe.