In this picture we see downtown St. Louis in the evening. If you look at the left leg of the St. Louis Arch you will notice that it is in fact a reflection of the right leg in the PEABODY building nearby.
At 630 feet, the Gateway Arch is the nation's tallest monument. It is part of the Jefferson National Expansion Memorial, established to commemorate westward expansion in the United States between 1803 and 1890.