Many American presidents have kept prized possessions within reach during their White House years. Franklin D. Roosevelt cherished a 19th century ship model of the U.S.S. Constitution. One of Dwight D. Eisenhower’s favorite gifts was an engraved Steuben glass bowl from his cabinet. And sitting on John F. Kennedy’s desk in the Oval Office was a paperweight made from a coconut shell he had carved with a distress message after his PT-109 was sunk during World War II.