In this 1952 photo from the U.N. Relief and Works Agency, UNRWA, archive, refugees walk through Nahr el-Bared, Lebanon refugee camp, one of the first camps established as part of emergency measures to shelter Palestine refugees of the Arab-Israeli conflict in 1948. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/S.Madver, UNRWA Photo Archives)
In this 1971 photo from the U.N. Relief and Works Agency, UNRWA, archive, Palestinian refugees pose for picture in the New Amman refugee camp in Eastern Jordan. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/G.Nehmeh, UNRWA Photo Archives)
In this undated photo from the U.N. Relief and Works Agency, UNRWA, archive, a steam roller over the "streets" of Janzur refugee camp near Jenin in the West Bank, which was organized by the International Committee of the Red Cross. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/UNRWA Photo Archives)
In this 1948 photo from the U.N. Relief and Works Agency, UNRWA, archive, Palestinian refugees stand outside their tent in Khan Younis, Gaza Strip. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/UNRWA Photo Archives)
In this 1967 photo from the U.N. Relief and Works Agency, UNRWA, archive, Palestine refugees flee across over the Jordan river on the damaged Allenby Bridge during the 1967 Arab-Israeli war. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/UNRWA Photo Archives)
In this 1948 photo from the U.N. Relief and Works Agency, UNRWA, archive, a convey of trucks and cars led by white U.N. jeeps travels through the Gaza desert carrying Arab refugees and their belongings from Gaza to Hebron, Transjordan. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/UNRWA Photo Archives)
In this 1968 photo from the U.N. Relief and Works Agency, UNRWA, archive, Palestinian refugees have just arrived in east Jordan in a continuing exodus of Palestinians from the West Bank and Gaza Strip. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. The distances on the partially obscured signboard read "Jericho 8 km, Jerslm (Jerusalem) 43 km." (AP Photo/G.Nehmeh, UNRWA Photo Archives)
In this 1975 photo from the U.N. Relief and Works Agency, UNRWA, archive, Fathiyeh Sattari, a worried Palestinian mother talks to a doctor about her underweight child, Hassan, who is being treated at a Rafah health center run by the U.N. Relief and Works Agency, UNRWA. The photo is part of UNWRA's vast photo archive being digitized in Gaza and Denmark to preserve a record of one of the world's most entrenched refugee problems, created in what the Palestinians call the "Nakba," or “catastrophe”-- their uprooting in the war over Israel's 1948 creation. (AP Photo/G.Nehmeh, UNRWA Photo Archives)