The Centennial Hall was opened to the public in 1913 and it is the only building in our city listed as a UNESCO World Heritage Site . Its uniqueness lies in the use of reinforced concrete on such a huge scale. it was the largest building of this kind at the time of construction. The symmetrical quatrefoil shape with a large circular central space seats 7,000 persons. The building itself is over 40 m high and the diameter of the dome is 70 m. The Centennial Hall became a key reference for the development of reinforced concrete structures in the 20th century - till today it has no competitors in the whole World.