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Built primarily between 1966 and 1975, it was dedicated on April 4, 1973, and was destroyed during the September 11 attacks in 2001.
c. 6,000–25,000 [d] The World Trade Center in New York City was destroyed on September 11, 2001, as a result of al-Qaeda terror attacks. Two commercial airliners hijacked by terrorists were deliberately flown into the Twin Towers of the complex, resulting in a total progressive collapse that killed almost 3,000 people.
The Eiffel Tower (/ ˈaɪfəl / ⓘ EYE-fəl; French: Tour Eiffel [tuʁ ɛfɛl] ⓘ) is a wrought-iron lattice tower on the Champ de Mars in Paris, France. It is named after the engineer Gustave Eiffel, whose company designed and built the tower from 1887 to 1889.
One World Trade Center, also known as One WTC and Freedom Tower, [note 1] is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City.
The Leaning Tower of Pisa (Italian: torre pendente di Pisa [ˈtorre penˈdɛnte di ˈpiːza, - ˈpiːsa] [1]), or simply the Tower of Pisa (torre di Pisa), is the campanile, or freestanding bell tower, of Pisa Cathedral. It is known for its nearly four-degree lean, the result of an unstable foundation.
The Burj Khalifa[a] (known as the Burj Dubai prior to its inauguration) is a skyscraper in Dubai, United Arab Emirates. It is the world's tallest structure.
The Mariana Trench is an oceanic trench located in the western Pacific Ocean, about 200 kilometres (124 mi) east of the Mariana Islands; it is the deepest oceanic trench on Earth. It is crescent-shaped and measures about 2,550 km (1,580 mi) in length and 69 km (43 mi) in width.
