“Iwo Jima Map”: Did a Japanese map found during World War II play a role in the Battle of Iwo Jima? “Copperhead Cane”: Tracing the Civil War-era history of cane topped with a coiled snake. “Theremin”: Is an instrument owned by a New Mexico man one of the few built by Leon Theremin himself?

Monday, June 28, 2010, 9:00-10:00 p.m. ET

First, detective Eduardo Pagán investigates the history of a hand-drawn map taken from the body of a Japanese soldier during the World War II battle of Iwo Jima in the segment "Iwo Jima Map." Then, in "Copperhead Cane," Wes Cowan follows the story of a cane topped with a coiled snake with ties to the anti-Abraham Lincoln group the "Peace Democrats." Finally, in the segment "Theremin," Elyse Luray traces the origins of the Theremin - one of the first electronic musical instruments - and finds out if a New Mexico man owns one of the fewer than a dozen Theremins in the U.S. built by Leon Theremin himself.