Yellowstone is one of the oldest national parks in the world. President Ulysses S. Grant signed it into law in 1872. The park stretches across Montana, Wyoming, and Idaho, with scattered geothermic features spread across the land. Old Faithful, the most famous of the attractions, is a geyser that erupts every 91 minutes. I have to say that my favorite site in the park is The Grand Prismatic Spring, which is appropriately named. It’s the 3rd largest hot spring in the world, but maybe the most striking with the colors that seep out of its blue center. I’ve traveled a bit here and there in my lifetime and seen a lot of beautiful places. But I have to admit, a trip to Yellowstone will help you remember that striking natural wonders still exist in the continental US.