- 1Originally completed in 1931, the Empire State Building (which takes its name from the nickname of New York State) was for a long time the world's tallest building. It was surpassed in 1972 by the World Trade Center, and later by a number of other buildings around the world. As of 2001, with the destruction of the World Trade Center in the 9/11 terrorist attacks, the Empire State once again became the tallest building in New York City. It has 102 stories and stands at 1,250 feet (1,454 if you include the antenna spire.)
- 3The CN Tower of Downtown Toronto, Canada, serves as both a communications and observation tower. It stands at 553 meters (or about 1,815 feet), and was the world's tallest free-standing structure and world's tallest tower when it was completed in 1976. (It was later surpassed as "tallest tower" by the Burj Khalifa and Canton Tower but remains the tallest free-standing structure in the Western Hemisphere, and an internationally recognized symbol of Canada.) The name "CN" originally stood for Canadian National, the railway company that helped sponsor the tower. Today, it is sometimes referred to as "The Canadian National Tower" or "Canada's National Tower."
- 4The canal is a 51 mile man-made waterway connecting the Pacific Ocean to the Caribbean Sea, and the Atlantic Ocean, cutting through the Isthmus of Panama. Since its completion in 1914, it has been an important route for international trade, as it eliminated the need for ships to sail around Cape Horn below South America to travel between the two oceans. Construction of the Canal took over 30 years and remains one of the most complex and significant engineering projects ever attempted. Its construction is often credited with allowing greater settlement in the US West Coast and making that area more viable to participate in international trade and the world economy.
- 5The Channel Tunnel (sometimes shorted as the "Chunnel") is an undersea railway connecting the United Kingdom with France. The tunnel, which opened in 1994, runs beneath the English Channel at the Strait of Dover. At its lowest point, it is about 250 feet deep. The Channel Tunnel contains the longest undersea tunnel segment in the world, though overall Japan's Seikan Tunnel is longer and deeper. The Chunnel runs between Folkestone, Kent, in the UK and Coquelles, near Calais, in Northern France. It is currently operated by the Eurostar passenger train company.
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