midway geyser basin
"how deeply with beauty is beauty overlaid!"
- john muir
seeing and smelling this was just breathtaking (seeing was nicer than smelling...)! ;)
yellowstone national park has a lot of geysers to discover and i especially loved the blue and green looking ones.
thermophilic cyanobacteria (mircoscopic organisms) help create the orange color that add even more interestingness to it.