Some parts of the largest megalithic site in Southeast Asia at Gunung Padang, Cianjur, West Java, Indonesia are observed. We report some conjectures on the elements of archaeo-astronomy, archaeo-geography, and archaeo-musicology for further studies on the ancient settlement of West Java responsible for the megalithic architectural structure. The presentation is on the possibility of geographical map, sundial calendar/clock, and stones that are used as source of sounds within parts of the site. Apparently, archaeology is necessarily inter-disciplinary when it comes to the complexity behind any archaeological structures.