The Lincoln Memorial in Washington may look impressive, but it sure took a long time to build - taking more than 50 years to open to the public from when construction began 1914The twin Petronas Towers Kuala Lumpur, Malaysia, can be seen mid-construction in 1995. The towers have 88 storeys each, and each stand 1,483 feet above street levelMore than 10,000 workers helped construct the Twin Towers, 60 of which were killed on the job. After they were finished in 1970 they attracted global attention. Miraculously in 1974 French tightrope walker Phillipe Petit strung a rope between the two buildings and bravely walked across. They were tragically destroyed in 2001 by terrorist group Al Qaeda, which flew two airliners into them
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