America Unearthed - Season 2 Episode 3 -

Since the 1800s, the City of Rockwall, Texas has had a mystery it's been trying to solve. Allegedly, the town was built on a massive rock wall that was constructed by some ancient civilization…or even giants. Could it be true? Scott Wolter conducts a massive excavation of the wall to figure out who–or what–created this wall and the controversy surrounding it.