One World Trade Center's long-awaited observatory opened May 29. Located on floors 100, 101 and 102 of the tower, the 47-second elevator trip is as remarkable as the sites from the 1,250 foot high observatory.
Jun 1, 2015   The Telegraph U.K.
France is hoping to establish a "darkness reserve" by regulating street lighting in towns and villages near a mountaintop observatory.
Apr 6, 2009   Discovery