Rosslyn Chapel, Scotland
This chapel is full of mysteries. It appears to have engravings of North American plants (like Indian corn), but it was built several years before the voyage of Columbus. They don’t let us take pictures inside, so sorry about that, but the Rosslyn Chapel website has a lot of very good information and pictures of the interior engravings, including one of Satan himself and another of Lucifer, bound and suspended upside-down. The chapel experienced a surge of popularity after Dan Brown set part of his lamentable book, the Da Vinci Code, there.