This memorial is the tomb of the great Gnostic and poet of the late 4th and early 5th centuries AH. The tomb is located on a hill in the northwest of Hamadan. The structure was constructed in the years 1967-1970. This tomb is on the basis of an octagon. Undefined Eight pillars of the tower, stone slabs of the tomb and its base, together with the steps and the surrounding paved area, are all of sculptured granite.
The main structure is to the dimensions of 10m x10 m and has entrances along with light sutures. The facade and flooring of the structure are of stone, and inscriptions are worked with tiles. Within the internal area are 24 pieces of marble affixed, each having a verse from the poems of this reputed personality.
Baba Taher Oryan was one of the most revered early poets in Persian literature. Most of his life is clouded in mystery. He probably lived in Hamadan. His byname, ʿOryān (“The Naked”), suggests that he was a wandering dervish or mystic. Legend tells that the poet, an illiterate woodcutter, attended lectures at a religious college, where he was ridiculed by the scholars and students because of his lack of education and sophistication. After experiencing a vision in which philosophic truths were revealed to him, he returned to the school and spoke of what he had seen, astounding those present by his wisdom.
His poetry is written in a dialect of Persian and he is most famous for his du-baytī (double distichs), exhibiting in melodious and flowing language a sincerity and spirituality with profound philosophical undertones. Bābā Ṭāher is highly revered even now in Iran.
and a mausoleum was erected for him in Hamadan in 1965 (restored 2004). Many of his poems have been translated into English in E. Heron-Allen’s The Laments of Baba Tahir (1902), A.J. Arberry’s Poems of a Persian Sūfī (1937), and in Mehdi Nakhosteen’s The Rubáiyyát of Bábá Táhir Oryán (1967).
Source: https://www.itto.org/iran/attraction/Mausoleum-of-Baba-Taher/
https://www.britannica.com/biography/Baba-Taher-Oryan
https://en.wikipedia.org/wiki/Baba_Tahir