The mostly completed New Acropolis Museum was briefly opened to the public free of charge, as part of International Museum day. The Acropolis itself was also opened for free. I was in Athens once before when this day took place & was surprised that the gates were open on the Acropolis with nobody checking tickets – its great that they can have days like this, but it would be even better if they were publicicised more in advance rather than afterwards.
Athens News Agency 
Acropolis Museum briefly opens
Culture Minister Mihalis Liapis toured the new Acropolis Museum on Sunday, on the occasion of the International Museum Day, where he expressed a hope that archaeological sites and museums will become part of citizens’ everyday routine.
According to figures released on Sunday, 4,000 people visited the museum and more than 5,500 entered the Acropolis-related archaeological sites.
Liapis also announced that the ministry will begin a pilot programme to combine cultural heritage with the modern trends.
“Our goal is to give a new lease of life to the sites and to breed new cultural cells,” he said.
Visitors toured the almost completed New Acropolis Museum’s courtyard on Sunday, which opened to the public.