Police officers look on as a firework thrown by protesters explodes in front of them in the central district of Exarchia in Athens following a commemorative rally marking the eighth anniversary of the killing of teenager Alexandros Grigoropoulos by a Greek police officer. Photo Aris Messinis/AFP/Getty
A girl stands next to a monument inside the Athens’ Polytechnic school, on the 43rd anniversary of a 1973 student uprising against the then military ruling junta in Athens, Greece. Photo Alkis Konstantinidis/Reuters
U.S. President Barack Obama passes the Parthenon while touring the Acropolis with Dr. Eleni Banou from the Ministry of Culture in Athens, Greece. Photo Kevin Lamarque/Reuters
US President Barack Obama waves as he arrives at the Athens International Airport in Athens, Greece. The US President is on a two-day visit to Athens. Photo Wassilis Aswestopoulo/EPA
A child peers out of her tent at the Souda municipality-run refugee camp on the Greek island of Chios. Photo Louisa Gouliamaki/AFP/Getty
Louisa Gouliamaki/AFP/Getty Images
Greek presidental guards walk down from the ancient Acropolis in Athens as people gather during a ceremony marking the liberation of the city from the German occupiers during the World War II. Photo Louisa Gouliamaki/AFP/Getty Images
An Afghan girl counts in Greek the numbers on the wall during a lesson by a non governmental organization at a refugee camp in the western Athens’ suburb of Schisto
Greek Prime Minister Alexis Tsipras welcomes Italian Prime Minister Matteo Renzi for a summit of southern European states at Zappeion Hall in Athens, Greece
A migrant girl sleeps under a mosquito net outside the former international airport in Athens, currently used as a temporary camp for migrants and refugees
Dense smoke over Lithi village during a wildfire on Chios island, Greece. The huge wildfire that broke out on Sunday on the island of Chios which has burned 3,500 hectares of forest and farm land
Milos Bicanski/Getty Images
Refugees are seen in the unofficial camp for migrants and refugees situated at the Athens 2004 Hellenikon Olympic complex within the old Athens airport in Hellinikon, Greece.
A boy sits on a bus as he waits to be transferred to a reception centre during an evacuation operation by Greek police forces of the makeshift camp at the Greek-Macedonian border, near the village of Idomeni, on today.
A child and a man sit on the tracks in front of Greek policemen in riot gear during a protest at the northern Greek border point of Idomeni, Greece
Orthodox Christian worshippers hold crosses before a procession along the Via Dolorosa on Good Friday during Holy Week in Jerusalem’s Old City
A boy stands inside a building used as sleeping quarters at camp for refugees and migrants in Schisto, near Athens, Greece
Joe klamar/Getty Images
Children play football at a makeshift camp for migrants and refugees at the Greek-Macedonian border near the village of Idomeni
People sleep in the port of Chios, Greece where refugees and migrants who managed to leave the VIAL detention centre a few days ago are camping
A shadow of migrants wait for food in the makeshift refugee camp at the northern Greek border point of Idomeni, Greece
Macedonian Army soldiers patrol between the two-line fence set along the border line between Macedonia and Greece, near southern Macedonian town of Gevgelija
Migrants play soccer at a makeshift camp for migrants and refugees at the Greek-Macedonian border near the village of Idomeni, Greece today.