Join Ghosts of DC on a field trip to explore President Herbert Hoover's rural getaway: Rapidan Camp. Learn about the camp's history and the precursor to Camp David, plus check out photos from the visit.

Who tossed Washington’s first pizza pie?  Was it “jumbo”?  Deep-dish?  Square?  Turns out, these are tough questions to answer.  Several attempts at D.C. historical pizza research have been made (some incorrectly) in recent years.  Here we’ll introduce the District’s pizza pioneers and tell you about their claims to be the first — rightly and wrongly (PS, here’s a great book on pizza’s global history). The Post tackled...