Bigger in Texas

In between Houston and Dallas, there is a great Texas landmark at which everyone driving on I-45 can't help but turn to stare. It's the Sam Houston Statue. I noted that approaching the statue from the south, I could see it for 4 miles before I actually drove past it! It's gigantic! Apparently it's the largest statue in the world of an American hero. Maybe they built the statue because they didn't want their little town known for it's other famous mark: The Walls of Huntsville Prison. I'll give you one try to guess why this Texas prison is well-known.