prehistoric cave paintings in a deep mountain forest at khao chan ngam, nakhon ratchasima

amphoe ancient antiquities archeology art astride cave chan civilization coloration coloring culture decayed deep depiction desert designs detail drawing forest heritage history inscription khao mountain nakhon natural nature ngam old outdoors paint painting paintings park past people petrology picture portrait portraying prehistoric ratchasima rock sandstone sikhio stone thailand time tinting travel variegated vestige wall