Tokyo Skytree is a broadcasting, restaurant, and observation tower in Sumida, Tokyo, Japan. It became the tallest structure in Japan in 2010 and the second tallest structure in the world after Burj Khalifa. The base of the tower has a structure similar to a tripod; from a height of about 350 m and above, the tower's structure is cylindrical to offer panoramic views of the river and the city.
There are observatories at 350 m, with a capacity of up to 2000 people, and 450 m , with a capacity of 900 people. The upper observatory features a spiral, glass-covered skywalk in which visitors ascend the last 5 meters to the highest point at the upper platform. A section of glass flooring gives visitors a direct downward view of the streets below.The tower has seismic proofing, including a central shaft made of reinforced concrete. The main internal pillar is attached to the outer tower structure 125 meters above ground. From there until 375 meters the pillar is attached to the tower frame with oil dampers, which act as cushions during an earthquake. According to the designers, the dampers can absorb 50 percent of the energy from an earthquake.[Source]