We men never grow up : Sandstone carvings turn black and shiny from hands repeatedly rubbing them.
Angkor Wat is the largest religious structure in the world. It is Hindu in basis, dedicated to the God Vishnu.
It was also the center (of power) of the state of Kampuchea during its time, as well as being designed including reservoirs and canals used to provide a consistent water source to the population enabling rice to be grown and harvested three times annually rather than once after the rainy season.