Napoleon's soldiers blew up part of the Parthenon.
No, the Venetians blew up the Parthenon (although the Turks were using it at the time as an ammunition dump, which is why it exploded). I think you're thinking of the Great Sphinx, which Napoleon's soldiers used for target practice.
I thought it was somebody else, but it's of no matter.
Had the Romans (and others) not burned the library at Alexandria (several times), we'd know a hell of a lot more about what the world knew and didn't know before Mohammed showed up.
I'd vote for that as possibly the single greatest crime in the history of the world. A tremendous setback. It's completely imponderable what things had to be re-discovered perhaps centuries later. Perhaps some things that haven't yet been re-discovered. Who knows?
I suppose that it's likely a moot point. If it hadn't already been burned, Mohammed might likely have been the one to do it anyway. :-)
Ahh, no. That would be the Ottoman Turks, who sited a powder magazine there, which blew up during a siege by the Venetians. Napoleon was never in Greece.