route way go to rock art on cliffs above the mekong estimated to be 3,000 years old at pha taem national park in ubon ratchathani,

above ancient anthropology archaeology archeology art artwork beautiful cave cliff cliffs destination direction estimated famous figures for forest heritage historic history journey landmark mekong mountain national natural nature old painting park path pathway paving people pha primitive ratchathani rock route sightseeing site stairs step stone street taem thailand tourism tourist travel travelers tree trip ubon visit walk walking walkway wall way years