TheNaturalWondersofTheWorld YellowstoneNationalPark GeysersSuperVolcanoWildlifeSandDunes 沙丘 OldFaithful GrandCanyon 大峡谷 over250milesalongtheColoradoRiver GreatBlueHole Underw atersinkhole 灰岩坑 300macross120mdeep AuroraBorealis 北极光 March April SeptemberandOctober VictoriaFalls 1 7kmwideand108metershigh
