The 18th-century Downhill Castle, home of Bishop Frederick Augustus Hervey, is one of the most haunting ruins on the island. Looking at the sky through every window frame, it takes a bit of effort to imagine the naughty bishop sprinkling talcum powder down the bedroom corridor to see which of his guests were hooking up in the middle of the night. Perched on a nearby cliff, Mussenden Temple was designed to be a library hideaway for the bishop's cousin (and rumored lover), Frideswide Mussenden, but she died young — worn out with scandal, so they say — and the Roman-style folly was finished as her memorial.