I know there are other photos of this on trek earth. Its easier to quote wikipedia about it than try and explain it myself:
"Under the status quo, no part of what is designated as common territory may be so much as rearranged without consent from all communities. This often leads to the neglect of badly needed repairs when the communities cannot come to an agreement among themselves about the final shape of a project....A sign of this state of affairs is located on a window ledge over the church's entrance. Someone placed a wooden ladder there sometime before 1852, when the status quo defined both the doors and the window ledges as common ground. The ladder remains there to this day, in almost exactly the same position it can be seen to occupy in century-old photographs and engravings. An engraving by David Roberts in 1839 also shows the same ladder in the same position."
"No one controls the main entrance. In 1192, Saladin assigned responsibility for it to the Muslim Nuseibeh family. The Joudeh Al-Goudia family were entrusted as custodian to the keys of the Holy Sepulchre by the Ottomans few hundred years later, and both families now share the responsibility. This arrangement has persisted into modern times."
Nobody has marked this note useful