In October of last year, UNESCO voted to accept Palestine as a full member. As reported by the New York Times in Unesco Accepts Palestinians as Full Members:

Cheers filled the hall at Unesco’s headquarters here after the vote, with one delegate shouting, “Long live Palestine!” in French. The Palestinian foreign minister, Riad al-Malki, praised the organization, saying that “this vote will help erase a tiny part of the injustice done to the Palestinian people” and that it would help protect world heritage sites in Israeli-occupied territory.

The New York Times reported further:

The United States argues that United Nations agencies should wait for a resolution of the Palestinians’ application for full membership in the United Nations as a whole. Palestinian statehood should emerge from negotiations with Israel, not from acts by third parties or international groups, Washington argues; otherwise United Nations membership will change little for Palestinians on the ground.
Arab diplomats say that the American position is a bit disingenuous, since Washington has maneuvered to try to prevent the Palestinians from getting the necessary 9 votes in the 15-seat Security Council, and would use its veto there if they did. The announcement on Monday by Bosnia, which currently has a seat on the Council, that it would abstain appeared to deny the Palestinians the chance for nine yes votes, making an American veto appear unnecessary.
At Unesco, though, no country has a veto.

The American view is mangled here to make it look disingenuous. The official American view is that a Palestinian state should emerge from negotiations with Israel. Any attempt to bypass negotiations – whether within the Security Council or other UN agencies – is in opposition to American policy.

And of course, UNESCO is the source of all that is good and pure in the world, that is only opposed by Israel and the United States:

Unesco, perhaps best known for designating world heritage sites, is a major global development agency whose missions include promoting literacy, science, clean water and education, including sex education and promoting equal treatment for girls and young women.
The United States rejoined the organization in 2003, ending a boycott that began under 1984 over charges that the organization then was corrupt, anti-Israel and anti-Western and wanted to regulate the international news media.

The idea that UNESCO like every other UN agency is politicized by an automatic majority that opposes Israel, seems to have escaped the reporters. Now the pretense that acceptance of Palestine into UNESCO is anything other than an anti-Israel move is over. (h/t Challah Hu Akbar)  

The list of sites submitted to the organization includes the Church of the Nativity in Bethlehem, the Old City of Nablus, Sebastiya, the ancient port of Gaza, Hisham's Palace and Tel al Sultan in Jericho, Mount Grizim, the monasteries in Judea Dessert and Rehan Forest.
…
Along with the list of sites under the PA's control, the Palestinians are also considering submitting heritage sites that are under Israeli control such as Qumran Caves and the Dead Sea.
Officials in Ramallah told Ynet they see nothing wrong with the PA proposing to recognize these sites on behalf of Palestine.

And for anyone who doesn't understand what's going on:

"It's very simple – according to the international law, the entire West Bank is occupied territory and therefore all of the countries who recognize a Palestinian state within the 1967 borders will support this."

Exactly. It's an effort to bypass negotiations by enlisting international agreement to support the Palestinians' demands.