The Obamas' Nighttime Tour of the Acropolis - See The Photos

Former US President Barack Obama and his family secretly visited the Acropolis Museum and the Acropolis Hill.

The former president is in Greece for the "Obama Foundation Leaders" meeting, which took place early Wednesday afternoon in a central hotel in Athens.

Subsequently, visits to the Acropolis and its adjacent museum took place, which had not been announced for security reasons.

See the photos from the night visit of Barack Obama and his family to the Acropolis:

Before climbing the Acropolis, the Obamas visited the museum where they were given a private tour. The former US president entered through the door at the back of the building.

Check out the photos:

See photos from the private tour:

Earlier, speaking at the Obama Foundation's event on Greece, Barack Obama said Greece is a small country which nevertheless always impresses him.

In the past, he said, Greece was a crossroads of cultures connecting the West with the East, a centre of culture as well as commerce. Greece, he stressed, has left an indelible mark on history and world culture.

Today, Barack Obama will participate in a discussion at the Stavros Niarchos Foundation Cultural Center with SNF President Andreas Dracopoulos as part of the SNF Nostos Conference, on ways to strengthen democracy and the importance of supporting the next generation of leaders.

The president of New Democracy, Kyriakos Mitsotakis, will also attend the discussion.

READ MORE: After Customs Seizure, U.S. Returns 'Priceless' ancient coins to Greece.