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.
Architecture of Toronto
The most prominent landmark in Toronto, and its best known symbol, is the CN Tower. It was the world's tallest free-standing structure for 31 years, from its completion in 1975 until Burj Khalifa in Dubai, United Arab Emirates surpassed it in 2007; it remains the tallest free-standing "tower" in the Western Hemisphere. The CN Tower is used as an observation tower, as well as a communications tower. Another landmark structure is Casa Loma. Constructed by E. J. Lennox during the early 1910s, it is a Gothic revival-style castle located on Walmer and Davenport roads. It was originally the residence of Sir Henry Pellatt, a Canadian financier and soldier. The city later took over the castle when Pellatt could no longer afford to keep it. The building presently operates as a museum.