the ancient mushroom d stone pillar naturally occurring used by human in dvaravati era

adventure aged ancient antique archaeological ban bat big boulder buddhism building district dvaravati era formation geological heap heritage highland historic historical history holy huge human landscape made man massive mushroom natural naturally nature northeastern occurring old outdoor overlap park phra phu phue pile pillar place prehistoric province religious remains rock ruin sacred shaped shrine site spire stone strange talus temple thailand thani tourism udon unusual used