The purposes of the Trust are to: preserve, protect, and enhance districts, sites, buildings, structures, and objects of significance in the prehistory, history, upland and underwater archaeology, architecture, engineering, and culture of the State; encourage others to do the same; and promote interest in and study of those things listed in item (1) of this subsection. The Trust is charitable and is intended to benefit the residents of the State. The General Assembly may modify the Trust to carry out the purposes of the Trust.