ancient antique saphan mon or uttamanusorn longest wooden bridge damage broken from flash flood in songkalia river for thai people

abandoned ancient antique architecture attraction beautiful bridge broken building buri countryside damage danger dangerous destination destroy disaster environment flash flood forest heritage historic historical history kanchanaburi landmark mon mountain natural nature old risk river rural sangkhla sangkhlaburi scene scenery scenic sightseeing songkalia structure thai thailand travel trip uttamanusorn wood wooden