Parmentier visited the ruins of the Lao temple complex Vat Phou, he paid special attention to Krol Roméas (Phnom Kulen plateau), Angkor and the Bayon temple in particular, which he helped reconstructing. His collaboration with Louis Finot and Victor Golubev on Banteay Srei, a Khmer temple complex, was published as a book in 1926.