Further to my last comment I have just seen this :
As of TOMORROW Wednesday, 29 July, masks will be mandatory in more indoors spaces in Greece.
Full details here
https://realgreekexperiences.com/greece-is-reopening-for-to…
For both employees and customers:
- All grocery stores (bakeries, butchers etc), including supermarkets where it was already mandatory
- All other retail stores
- Offices and businesses where there is contact with customers (e.g. banks, public services)
- Doctors' practices, other medical services
- Hair salons, beauty parlours
- Elevators
Reminder that masks remain mandatory in all public transportation (metro, buses, ferries etc) and taxis.
In addition, masks will be mandatory for all EMPLOYEES in cafes, restaurants, tavernas and other places where food and drink is served.
The fine for not wearing a mask is 150 euro.
Museums have not explicitly been mentioned, but I am sure there will be further clarifications in the next day or two.