SAN DIEGO (KUSI) - It isn't oft-photographed like the White House. It's not the site of celebrity-filled black-tie state dinners. It's not the backdrop for our selfies. Yet Camp David plays a crucial, and often unheralded role in the modern presidency, one that hasn't been examined closely, until now. INSIDE CAMP DAVID: The Private World of the Presidential Retreat, by Rear Admiral Michael Giorgioni, takes readers inside the gates of the private retreat atop Maryland's Catoctin Mountains.