Lowell Thomas was a renowned broadcaster who was a well-traveled person. He broadcast his radio shows from all around the world, wherever he happened to travel. Additionally, he narrated dozens of movie travelogues in the 1930s, as well as wrote many books about his travels.
I'd heard some of his early radio broadcasts when I was collecting 'old-time radio shows' in the late 1960s and early 1970s. He always made everything so very interesting.
In 1980, I wrote to him at his residence in Pawling, New York, sending him two photos I requested he sign. He did, and returned them within one week. They can be seen here and here.