This gold grill is the front part of the Roza Mubarak, the Sacred Chamber in which the Prophet Muhammad (peace and blessings of Allah be on him) passed away and where he is buried. It also houses the graves of the first two Caliphs of Islam, Abu Bakr (may Allah be pleased with him) and Umar (may Allah be pleased with him).

With regards visiting Madinah and performing the Ziyarah (visiting the grave of the Holy Prophet (peace and blessings of Allah be on him)), the Prophet (peace and blessings of Allah be on him) said:"Whoever visits me after my death is like he who had visited me during my life." [Tabraani] "Whoever performs his Hajj in Makkah, then comes to Madinah with the sole aim of visiting me in my Masjid, for him shall be written (the rewards of) two accepted Hajj." [Daylami] "When a person stands at my grave reciting blessings on me, I hear it; and whoever calls for blessings on me in any other place, his every need in this world and in the hereafter is fulfilled and on the day of Qiyamat I shall be his witness and intercessor." [Bayhaqi]
The viewing holes above are aligned to the faces of the inhabitants of the graves. The largest hole on the left directly faces the noble face of the Prophet Muhammad (peace and blessings of Allah be on him). The one in the middle is aligned to the face of Abu Bakr (may Allah be pleased with him) and likewise the one on the right is aligned to the face of Umar (may Allah be pleased with him).