Admission is free on the following days:
- Every first Sunday of the month from November 1 to March 31.
- On the national holiday, October 28.
- On anniversaries or international congresses
- April 18 (International Day for Monuments)
- May 18 (International Museum Day)
- The two-day European Heritage Days (last weekend in September each year)
- March 6 (Memorial Day for Melina Mercouri)
