What was really Por-bazhyn – a castle, a palace of the ruler, a mandala or a temple? What does the complicated labyrinth of its buildings and structures represent? Candidate of physical and mathematical sciences Dadar-ool Dan-Sürün presented his version. In his opinion, Por-Bazhyn is an ancient Uighur observatory. He shared his version with the readers of “Tuvinskaya Pravda” and “Subbotnaya panorama”. The publication caused a great resonance. One of the first who responded was Doctor of historical sciences, professor of TGU Nikolai Abayev.