It might feel good on your face, but have you ever wondered what's actually in that cream you're slathering on your skin? Inside that pretty bottle may lurk some pretty odd ingredients. History tells us that women have often resorted to unusual substances in the pursuit of beauty—Cleopatra was fond of her milk baths, while Japanese geishas swore by nightingale-dropping facials. But even they might shake their heads at some of the strange ingredients being used in skincare products today. Check out six of the most unusual.