Probably the coolest spot so far - Grand Prismatic Spring. The blue and orange colors are spectacular! There is a wooden walkway that goes around the area so you really get an idea of how awesome the geothermal features are. As you walk along the boardwalk, hot steam rises up and you can feel the moisture and heat - and smell some sulfur.
There is a dormant geyser downstream of this beautiful area called Excelsior Geyser. It used to erupt up until 1885-ish, with hot water and stream up to 300' high! For some reason, it erupted again in 1985 for a few days, then shut down again - very strange and interesting! I love this place!
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