How high is the vacuum column?

In the memorial buildings in Rome, besides the Arc de Triomphe, there are also the pillars of the Hijigong. Up to now, Trajan's and olivier's Jigongzhu have remained in Rome. Both pillars are decorated with reliefs, of which the Trajan pillar is the most prominent. Trajan Column, with a total height of 38 meters and a height of 27 meters, is made of marble blocks and stands on a square base. Surrounded by a spiral relief belt composed of 22 circles, the total length of the relief is about 200 meters. There are as many as 2500 figures on the relief. The embossed ribbon shows Trajan leading the Romans into Dach. The cylinder is 3 meters in diameter, with a peach lotus stigma at the top and a statue of Trajan on the top. The foundation of the column is Ionian, and the ashes of Trajan and his wife are buried under the foundation. A bust of a giant is carved on the base ring of the memorial column. It is said that this giant symbolizes the Danube. The Romans are preparing to cross the river, and the soldiers are building fortifications and holding their ground. Trajan admonished the soldiers. The development of the scene according to the narrative is very complicated, and Trajan is the center of all the scenes, appearing for 90 times. The whole sculpture is an image of the history of war, and it is also the longest stereoscopic map of the history of war in the world. Relief has rich historical authenticity in depicting characters' looks, national characteristics and costumes. It is said that a herdsman, a descendant of the Dachis living in Romania, wanted to meet his ancestors and came to Rome. When he saw the description of his ancestors on the column, he slept under it. A photojournalist found that the man looked like a big pool on the relief, so he took a photo. A few days later, the Roman newspaper published this photo with the title "Adachi stepped down from the Trajan column". The level of Roman realistic sculpture art is amazing.