英文關鍵字
yellowstone
castle
geyser
pool
united
states
tourist
archival
historical
america
travel
vintage
70s
retro
seventy
seventies
american
old
1970s
tourism
tour
steam
upper
basin
eruption
caldera
volcano
wyoming
bacteria
hot
water
thermal
thermophilic
cone
landmark
thermophiles
geothermal
famous
attraction
scenic
flowing
microorganisms
geology
mud
park
touristic
wild