'The Sinner's Grand Tour': 10 Sexy Places The Guidebooks Won't Tell You About (PHOTOS)

I've never been much interested in going to the Eiffel Tower, Big Ben, the Colosseum, or any of the standard tourist draws in Europe. When I travel, I like to track down some of the more specialized attractions - the ones that have always lured history's outsiders, the debauched aristocrats, wild monks and free-spirited noblewomen who populate the continent's secret past. Luckily, while researching "The Sinner's Grand Tour" (Broadway, May 2011), I discovered that Europe is still littered with underground historical sites. Seeking out these forgotten boudoirs, relics and dungeons provides travelers with an entirely fresh view of the most over-trodden destinations. Let your imagination run riot!