CN Tower: Tallest Buildings in the Western Hemisphere
The CN Tower is the tallest freestanding structure in the western hemisphere, standing at 351 meters. It features an observation deck that’s 350 m above ground level and a restaurant. Additionally, a comprehensive sprinkler system protects it. A ground-based pump connected to a municipal water source supplies the sprinklers with water. Its inlet relative pressure is 350 kPa. Commercial steel piping with an inner diameter of 7.5 cm makes up the CN Tower.

The American Society of Civil Engineers has chosen the CN Tower as one of the world’s seven new wonders. It is also a member of the World Federation of Great Towers and currently holds the second highest ranking among the tallest structures in the world. It is also the tallest habitable structure in Canada. When completed in 1975, it was the tallest freestanding building outside of New York City and Chicago.
Petronas Towers

The Petronas Towers was built with inspiration from Islamic art. The cross section of the building is based on the Rub el Hizb, and the circular sectors resemble the bottom part of the Qutub Minar.
The Petronas Towers are 88-storey twin towers in Kuala Lumpur, Malaysia. The world’s tallest double-decker bridge, the Sky Bridge, connects the twin buildings. Its design distinguishes it from other constructions since the towers are not attach, allowing them to slide in and out during high winds.
Petronius oil platform: Tallest Buildings in the Western Hemisphere
The Petronius oil platform is the tallest free-standing structure in the western hemisphere, and stands 610 meters above sea level. It was crowned the world’s tallest freestanding structure by Guinness World Records in 2007 and was eclipsed in 2010 by the Burj Khalifa. However, the question of how high an oil platform can be below water is still a matter of debate. Some oil platforms have a higher height below water than other types of oil platforms, and some have a much smaller depth.
About 210 kilometers southeast of New Orleans, on the floor of the Gulf of Mexico, is where you can find the Petronius oil platform. The platform is flexible and can deflect 2% of its height because it was constructed utilising a compliant tower design. In comparison, the bulk of structures has a maximum height deflection of 0.5%.
Willis Tower
image source – Google | Image by – Mike Balbus
The Willis Tower in Chicago is the tallest freestanding structure in the Western Hemisphere. Originally known as the Sears Tower, this 1973 construction. It has a total height of 1,450 feet, making it the tallest building in the world. The Willis Tower is a popular tourist attraction in Chicago. In 2009, the Willis Group leased part of the tower and renamed it to reflect the new name. United Airlines occupies the top 20 floors of the building.
The Willis Tower was once the Sears Tower, which closed its doors in 1999. This did not stop the structure from being referred to as the Sears Tower, either. When London-based Willis Group Holdings bought the structure in 2003, they leased a part of the tower and acquired the name rights to it. The Willis Tower changed its name to the Willis Tower formally on July 16, 2009.
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