Abdallah Abu al al-Husayn Ali architecture Asia asian Avicenna being beings burial commemorate commemoration day daylight daytime during exterior exteriors famous grave graves ground grounds Hamadan Hamedan historic historical historically history human humans Husayn ibn Iran Iranian Mausoleum mausoleums memorial memorials modern monument monuments of outdoor people Persia Persian person persons photo photos physician place places remembering remembrance seeing shot shots sight sights Sina the tomb tombs visitor visitors worth