Windows on the World was a complex of venues on the top floors (106th and 107th) of the North Tower (Building One) of the original World Trade Center complex in Lower Manhattan that included a restaurant called Windows on the World, it operated until 2001 when they were destroyed in the September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on which country?
September 11 attacks The September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States on the morning of Tuesday, September 11, 2001. The attacks killed 2,996 people, injured over 6,000 others, and caused at least $10 billion in infrastructure and property damage. 
January 2015 Île-de-France attacks From 7 January 2015 to 9 January 2015, terrorist attacks occurred across the Île-de-France region, particularly in Paris. Three attackers killed a total of 17 in four shooting attacks, and police then killed the three assailants. The attacks also wounded 22 other people. A fifth shooting attack did not result in any fatalities. Al-Qaeda in the Arabian Peninsula claimed responsibility and said that the coordinated attacks had been planned for years.