List of tallest buildings
The international non-profit organization Council on Tall Buildings and Urban Habitat (CTBUH) was formed in 1969 and announces the title of "The World's Tallest Building" and sets the standards by which buildings are measured. It maintains a list of the 100 tallest completed buildings in the world. The organization currently ranks Burj Khalifa in Dubai as the tallest at . The CTBUH only recognizes buildings that are complete however, and some buildings included within the lists in this article are not considered finished by the CTBUH.
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 .