Medical Definition of dorsiflexion. : flexion in a dorsal direction; especially : flexion of the foot in an upward directionâcompare plantar flexion.
Willis Tower. The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois, United States.
3. CN Tower, Canada - 1,815 Feet. At number 3 on the list of the world's tallest towers is the CN Tower in Toronto, Canada. At the time of its completion in 1976, the building was widely considered to be the world's tallest tower and free-standing structure.