Zooey Deschanel's Philly roots

Zooey Deschanel arrives at the 70th Annual Golden Globe Awards at the Beverly Hilton Hotel on Sunday Jan. 13, 2013, in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision/AP)

Actress Zooey Deschanel traveled around the area to investigate her Lancaster County Quaker relatives' involvement in the abolitionist movement in TLC's "Who Do You Think You Are?" airing tonight at 9.

With the help of Ancestry.com, Deschanel discovered that her great mom-mom Sarah Pownall was involved in the underground railroad. While learning about her fam, Deschanel visited the Free Library of Philadelphia and Friends Historical Library in Swarthmore, along with the Lancaster Historical Society in Lancaster and Pownall's land in Christiana, Lancaster County.