List of tallest buildings and structures
The world's tallest artificial structure is the Burj Khalifa in Dubai (of the United Arab Emirates). The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010. The second-tallest self-supporting structure and the tallest tower is the Tokyo Skytree. The tallest guyed structure is the KVLY-TV mast.
Washington Monument
At the time of its completion, it was the tallest building in the world, a title it retained until the Eiffel Tower was completed in 1889. It is the tallest building in Washington, D.C. The Heights of Buildings Act of 1910 restricts new building heights to no more than greater than the width of the adjacent street. This monument is vastly taller than the obelisks around the capitals of Europe and in Egypt and Ethiopia, but ordinary antique obelisks were quarried as a monolithic block of stone, and were therefore seldom taller than approximately .