When we look at old ruins, we may be tempted to think that time steadily wears down structures in an implacable, vague way. Let enough years go by and any building will crumble to its foundations or at least show severe wear and tear.
It's not necessarily true, though; some buildings and monuments have aged extremely well (check out the pristine 1800-year-old Pantheon in Rome, for example). Others, like the Colosseum or the Sphinx, look considerably more worse for wear - but it's not just the ravages of time that partially destroyed them. People actually damaged them at specific moments in history. Sometimes we know exactly when and how it happened.
Read on if you ever wondered why the Sphinx is missing a nose, or whether the Parthenon got all messed up in WWII. Answers (and a few new questions) await!