The wooden vessel is called "Noah's Violin." As it floated through Venice's Grand Canal on Saturday, members of the string quartet on board serenaded viewers with their own (real) instruments.

The "green pass" will show whether a person has been vaccinated, recently recovered from COVID, or tested negative for the virus. Workers failing to present a pass will be suspended without pay.

A map of confirmed COVID-19 cases and deaths around the world. The respiratory disease has spread rapidly across six continents and has killed at least 2 million globally.

Giuseppe Conte handed in his resignation Tuesday following weeks of political uncertainty and the loss of a coalition partner over his handling of the coronavirus' second wave and economic recovery.