(a) The commissioners court of a county with a population of 2.2 million or more may charge and collect a fee from the general public for admission to a county-operated museum, historical site, historical building, or other similar building or site.
(b) The commissioners court by order may set the admission fee authorized by this section.

(c) Admission fees charged and collected under this section shall be placed in a county special fund to be used by the commissioners court for the payment of costs associated with the administration, maintenance, security, or staffing necessary to operate the building or site. The special fund may not be expended for purposes other than those associated with the building or site.