It was destroyed by the Arabs, whose conquest of the Middle East and North Africa terminated Roman civilization in those regions and cut off Europe from any further trading and cultural contact with the East. According to Pirenne, it was only in the mid-seventh century that the characteristic features of classical life disappeared from Europe, after which time the continent began to develop its own distinctive and somewhat primitive medieval culture.
For a civilization that purports such greatness, where is the list of achievements? Even the short list is concocted of scientific achievements by first or second generation reverts, where free thought wasn't completely eradicated. Beyond that second generation, the plunder of wealth from conquered civilizations diminished rapidly and further jihad was necessary. islam brings absolutely NOTHING to the table.
I read that book, and it made great sense to me.