The ill-fated Sultana in Helena, Ark., just before it exploded on April 27, 1865, with about 2,500 people aboard. Most were Union soldiers, newly released from Confederate prison camps. Library of Congress hide caption

itoggle caption Library of Congress

This violin is said to have been played by bandmaster Wallace Hartley during the final moments before the sinking of the Titanic. It's thought he put the instrument in that leather case. Hartley's body and the case were found by a ship that responded to the disaster. Now the violin has been sold. Peter Muhly /AFP/Getty Images hide caption

itoggle caption Peter Muhly /AFP/Getty Images

April 4, 1912: The Titanic leaves Southampton, England, on her ill-fated first voyage. Southampton City Council /AFP/Getty Images hide caption

itoggle caption Southampton City Council /AFP/Getty Images

Laurie and Dan Castaneda from Long Beach, Calif., walk the pool deck of the Azamara Journey on a Titanic Memorial Cruise. Preparation for their costumes involved several weeks of research, last-minute purchases and even home-sewn clothing from vintage patterns. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP