A very colorful hotspring near the Grand Prismatic Spring in Yellowstone Nationalpark. The colors result from dispersed silica (blue/green) which refract the sunlight. The warmer colors are small organisms (thermophiles) which live in hot springs and are colorful to absorb the sunlight. From those thermophiles the first enzymes for RNA/DNA analysis have been found. Also this was the cornerstone to our COVID vaccines today.
A petrified redwood-sized tree in the Yellowstone Nationalpark. Sadly, it is just one and the whole forests of petrified trees are quite difficult to access (very long hikes).
Marvelous hot spring with thermophile bacteria growing at the drain of the pool, yielding yellow, green and brown mats of bacteria. This is one of the numerous hot springs and geysirs near old faithful geysir.
Takakkaw falls are very impressive. Daly glacier drains via Takakkaw lake into the falls before it joins the Yoho river in Yoho Nationalpark, British Columbia, Canada.
If you want to make nice shots be sure to arrive late as the waterfalls are facing west and thus morning light does not do any good for your images.
Mistaya Canyon in Banff Nationalpark, Alberta, Canada is really something unique. I dare to say that I've seen some canyons and ravines but such a deeply dug in stream was new to me. Make sure to spend some time and enjoy the power of the water here.