Left photo: John F. Kennedy campaigning for the U.S. Congress under a statue of Paul Revere in Boston in June 1946. Right photo: A guide dressed as a British soldier from the U.S. Revolutionary War leads a tour past the same statue on November 15, 2013.
Left photo: A young John F. Kennedy (second from right) and his grandparents talk to a priest outside St. Stephen's Church in the North End neighborhood of Boston, Massachusetts, in June 1946. Right photo: the same spot outside St. Stephen's on November 10, 2013.
Left photo: U.S. Congressman John F. Kennedy (second from left) walking in the Bunker Hill Day Parade in Charlestown, Massachusetts, on June 17, 1950. Right photo: Pedestrians cross Bunker Hill Street at the same spot on November 10, 2013.
Left photo: United States Senator John F. Kennedy (right) shakes hands with workers on Medford Square in Medford, Massachusetts in June 1958. Right photo: A cyclist riding around the same spot on November 11, 2013.
Left photo: U.S. President John F. Kennedy sitting in a rowboat with his son John F. Kennedy Jr. on Bailey's Beach in Newport, Rhode Island, on September 15, 1963. Right photo: The same spot on November 11, 2013.
Left photo: U.S. President John F. Kennedy and First Lady Jacqueline Kennedy greet supporters at Dallas Love Field in Dallas, Texas, on November 22, 1963. Right: The same scene at the site of the original photo on November 9, 2013.
Left photo: The motorcade of U.S. President John F. Kennedy as it moves through downtown Fort Worth, Texas, on November 22, 1963. Right photo: The Tarrant County Courthouse seen from Main Street in downtown Fort Worth, Texas, on November 8, 2013.
Left photo: Cars traveling on the road past the Texas School Book Depository in Dallas (now the Sixth Floor Museum) in Dealey Plaza on November 22, 1963. Right photo: The same place photographed on November 10, 2013.
Left photo: Bill and Gayle Newman, civilian eyewitnesses with their children as photographers take pictures in Dealey Plaza after Kennedy was shot on November 22, 1963. Right photo: Visitors to Dealey Plaza taking a photo of the site with a tablet in 2013.
Left photo: Flower arrangements and spectators are placed along Elm Street during a reconstruction of the Dealey Plaza crime scene by the U.S. Secret Service in Dallas in 1963. Right photo: Visitors to Dealey Plaza on November 10, 2013.
Left photo: Lee Harvey Oswald "holding a rifle in one hand and communist newspapers in the other" in the backyard of 214 W. Neely Street, in a photo believed to have been taken in Dallas in 1963. Right photo: The same place on November 12, 2013.
Left photo: The former residence of Lee Harvey Oswald at 214 West Neely Street in the Oak Cliff neighborhood of Dallas, Texas, in 1963. Right: The same site on November 12, 2013.
Left photo: U.S. Secret Service agents and local police examine the presidential limousine as it sits parked at Parkland Memorial Hospital in Dallas, Texas, on November 22, 1963. Right photo: The same parking area for ambulances on November 9, 2013.
Left photo: A Dallas Police Department vehicle parked in the 400 block of 10th Street in the Oak Cliff neighborhood of Dallas in 1963, where police officer J. D. Tippit was killed by Lee Harvey Oswald. Right photo: The same spot on November 8, 2013.
Left photo: An unidentified uniformed police officer in 1963 points at a seat in the Texas Theatre in Dallas where Oswald sat. Right photo: George Quartz, the events coordinator for the Texas Theatre, poses for a photograph at the same location on November 8, 2013.
Left photo: The General Lafayette Statue as U.S. President John F. Kennedy's flag-draped casket departs the White House, Washington, D.C., during his state funeral on November 24, 1963. Right photo: The same spot on November 5, 2013.