Yellowstone has a Grand Canyon which is not that Grand Canyon, and it also has its own Golden Gate, located just south of Mammoth Hot Springs. The name comes from the color of the rocks, some of which is due to native lichens.

The Golden Gate, and the road that passes through it, are important and historical parts of the park; over a century ago, the first paths were laid through this canyon, where you see the road and bridge in the photograph. This was a significant accomplishment as it made it much easier for stagecoaches carrying early tourists to reach Old Faithful and other areas of Yellowstone. Of course early travelers didn't have the benefits of modern civil engineering, and I can imagine the trip must have been rather hair-raising indeed...