ancient Angkor Angkor-Wat angles appearance archaeological archaeology buddhism Buddhist cambodia craftsmanship cultural culture damp decorative design features height heritage high Hindu Hinduism historical history jungle lichen mixture monument mosses old ornamental perspectives sculpted sculpture shaped stones stonework style surfaces temple-complex temples textured textures weathered arched arches architectural architecture bricks brickwork christian church community construction dirty elegant-tower exterior faith façade growths historic humid humidity Methodist ornamentation parapet protection protective religious roof roofing Sacred safety Singapore tower towering tropical tropipcal-plant-growth walls windows