I had known that my great-grandparents enjoyed traveling abroad in their early retirement years. They went (back) to Europe at least a couple of times and I have seen a photo of them in Mexico. Next time I am back at my parents' house, I will have to look through old photos again and see if any of them are dated January 1955.
©2015, Emily Kowalski Schroeder
Source: Passenger and Crew Manifests of Airplanes Arriving at San Antonio, Texas 1955-1957. NARA Microform publication A3974. 9 rolls. NAI: 2922359. Records of the Immigration and Naturalization Service, 1787-2004, Record Group 85, The National Archives at Washington, DC