Main glass entryway doors are marked in white approx quarter inch lettering 'Possession of a handgun under authority of Texas Concealed Handgun Permit Law, Texas Civil Statutes, Article 4413 (29ee) is prohibited beyond this point'. Also, if you enter from the parking garage through the gift shop, you do not use the main entrance and do not encounter any 'no guns' signs.
Recently visited on 8-22-09. No sign on parking garage entrance or the doors by the large black globe directly outside of them.