Archaeological sites and museums remain closed on:

January 1
March 25
Orthodox Easter Sunday
May 1
December 25
December 26

On the following days, the opening hours are as follows:

January 6:  8:00-15:00
Ash Monday:  8:00-15:00
Orthodox Good Friday:  closed until 12:00
Orthodox Holy Saturday:  8:00-15:00
Orthodox Easter Monday:  8:00-15:00
October 28:  8:00-15:00

As the rest of the year the opening hours of museums and sites may vary depending on the season (summer or winter), it is better to check before visiting.

Important Note: Entrance fees are to be paid at the entrance of museums & sites in Euros.