A UNESCO World Heritage Site, it has been called "Jerusalem's most recognizable landmark," along with two nearby Old City structures, the Western Wall, and the "Resurrection Rotunda" in the Church of the Holy Sepulchre. It is the earliest archaeologically-attested religious structure to be built by a Muslim ruler and the building's inscriptions contain the earliest epigraphic proclamations of Islam and of the Islamic prophet Muhammad. The inscriptions proved to be a milestone, as afterward they became a common feature in Islamic structures and almost always mention Muhammad. The Dome of the Rock remains a "unique monument of Islamic culture in almost all respects", including as a "work of art and as a cultural and pious document", according to historian Oleg Grabar.