This jet-set favorite on the rocky Argentario coast offers the best of both worlds: the medieval villages of the Maremma to the left and right and, straight in front of you, the blue-blue Tyrrhenian sea.
From Hawaii to Australia, India to Namibia, these destinations around the world are downright terrifying and sometimes even deadly, home to rampant shark attacks, eel-infested waters, deadly currents and toxic waste.