Aon

The third tallest building in Chicago, on Open Day, you can see the panorama of Chicago. It's great. The Cloud Gate of Millennium Park is really smaller than beans in such a high place. People become little ants.

The headquarters of Aon Group was the tallest building in Chicago when it was completed. It was replaced by Sears Tower. The building was square, simple but magnificent.

He was the tallest building in Chicago, and later Hills Tower surpassed his height, but it was still very tall. The building is rectangular, with a white stone surface and a two-inch thick Flagstone slab.

Yi'an Center is the building of Yi'an Group. The whole building is a skyscraper. It was the tallest building at that time. It was very domineering. I recommend it.

Yi'an Center is a landmark building here. The easiest thing to see is this high building, 300 stories high, very magnificent.

More than 300 meters of buildings are now one of the highest in Chicago, with no extra wires and lightning rods to make the net height more technical. The huge dark glass curtain wall with white stone wraps the whole square building. It is said that it was created in 1992 when it was renovated. The 80-storey office building is also the office choice of many famous international enterprises.

怡安中心算是怡安集团的建筑，整个建筑就是摩天大楼，是当时的第一高，非常霸气，推荐看看。

这在芝加哥中心一定要好好的去参观一下怡安中心，挺棒的。