Sex and travel have always been intertwined, and never more so than on the classic Grand Tour of Europe in the eighteenth and nineteenth centuries. Today the Continent is still littered with salacious remnants of that golden age, where secret boudoirs, notorious dungeons, and forbidden artifacts lured travelers all the way from London to Capri. In The Sinner's Grand Tour, celebrated historian and travel writer Tony Perrottet sets off to discover a...