WTC I think if I'm remembering correctly.

Well, given that the Tower of Babel never existed I am going to go with the WTC.

From Wikipedia on the tower of Babel : "The height of the tower is largely a matter of speculation, but since the tower symbolically can be considered a precursor to humankind's desire to build tall structures throughout history, its height is a significant aspect of it. The tower commissioned by Nebuchadnezzar in about 560 BC in the form of an eight-level ziggurat is believed by historians to have been about 100 meters (328 feet) in height. The narrative in the book of Genesis does not mention how tall the Biblical tower was, and it has traditionally not been much of a subject of debate. There are, however, relevant extra-canonical sources. The Book of Jubilees mentions the tower's height as being 5433 cubits and 2 palms (8,150 feet, 2,484 meters high), or nearly 2.5 kilometers, several times taller than the tallest modern structures. The Third Apocalypse of Baruch mentions that the 'tower of strife' reached a height of 463 cubits (694 feet and 6 inches, 212 meters high), taller than any other structure built in the ancient world including the Pyramid of Cheops in Giza, Egypt, and taller than any structure built in human history until the construction of the Eiffel Tower in 1889."