The Tamolitch Blue Pool in Central Oregon is one of the most stunning natural displays of color I have ever personally witnessed.
Anyone who knows me knows that all shades of turquoise/aqua/teal are MY COLORS. Most of the things I own and wear fall into these shades. So to see these vibrantly saturated hues existing in nature, with no human influence, was completely awe inspiring. It looked totally fake, like those ponds people have in their front yards that they pour some kind of chemical dye into.
The pool is fed by the MacKenzie River, which goes underground upriver and and emerges into the pool through lava. The waters are near-freezing year round, which results in the deep blue color and pristine clarity - apparently no algae can grow at this temperature so it remains clear, and no silt is disturbed by river flow or waterfall. Though the water looks inviting, it's not a swimming hole. The people we saw jump in all scrambled out immediately.
The hike is about 4 miles roundtrip along the MacKenzie River through old growth Douglas forest and lava flows. It was a hot day and we were quite sweaty by the time we made it to the cliffs above the pool, but we had difficulty finding the trail down to water. You have to climb over a dry waterfall - if there's enough rain the river will flood over the lava rocks above and cascade into the pool - and scrabble down rocky inclines, and my 3 year old was refusing to be carried on this hike (I was impressed that she hikes about 3.5 miles on her own but I finally picked her up near the end since the hike took us a few extra hours due to slow going). So we gave up trying to get down to the pool and just stopped to take a dip in the river on the hike back.
This natural jewel is definitely worth the trip to go see. I highly highly highly recommend it, and I hope to return someday and actually jump in.