VIDEO: Sneak Peek at Jesse Tyler Ferguson on TLC's WHO DO YOU THINK YOU ARE?
Last summer's season of Who Do You Think You Are led some of the world's most famous celebrities to make remarkable discoveries - from finding they were descended from European royalty to learning that their ancestors were involved in wars that changed the course of America. Throughout these journeys, they ultimately had a chance to make modern connections to the people in their lineage that were a part of history. C…