Rotonda rotunda rotunda in Luo Tongda is 83 meters high at the top and about 1 10 meters in diameter, making it the largest dome hall building in the world at that time, much larger than the 48-meter dome of St. Pierre's Cathedral in Rome and the 37-meter dome of St. Paul's Cathedral in London. The structure of the rotunda is also metal, and the construction period is only 18 months, which was incredible at that time. Architecture is called the eighth wonder of the world. The conical roof of the rotunda is supported by 32 thick columns. Above the dome, there is a dome tower with a diameter of 28 meters, and above it is a small dome lighthouse with a diameter of 7 meters. At the top, there is a huge replica of the Austrian crown, decorated with imitation crown jewels.
This huge dome building caused a sensation and attracted the audience. During the World Expo, 206,270 tourists climbed the steps leading to the dome crown, enjoyed the charming scenery of Vienna and were proud of the spectacular architecture. In addition to the industrial palace complex, there are more than 90 new buildings/kloc-0, such as machinery hall, art museum and gardening hall. The whole Expo harmoniously integrates different architectural elements of reality and art, modern and ancient, and eastern and western.