The Great Wall of China is the largest man-made structure in the world; it is visible from space, and has been photographed from space.
The world's tallest artificial structure is the 829.8 m (2,722 ft) tall Burj Khalifa in Dubai, United Arab Emirates. The building gained the official title of "Tallest Building in the World" at its opening on January 4, 2010. It is followed by the Tokyo Skytree, as the tallest tower, and the KVLY-TV mast
