|  | Zosia checks out one of the travertine terraces at Mammoth Hot Springs. | 
|  | Because the trailhead parking lot is full, Zosia begins the hike up Bunsen Peak from a pullout further up the highway. | 
|  | The trail climbs gently through light forest. | 
|  | At a switchback in the trail, a break in the trees grants this view overlooking Mammoth Hot Springs. At distant left is Sheep Mountain. | 
|  | Zosia directs attention to the elevation sign at the hut on the west summit. | 
|  | The equally high east summit is a short distance away. | 
Sonny and Zosia stand atop the east summit (2609 metres) of Bunsen Peak.
|  | Swan Lake is visible to the southwest along with peaks on the horizon including Trilobite Point, Mount Holmes, Dome Mountain, and Antler Peak. | 
|  | Electric Peak dominates the view to the northwest. | 
|  | Zosia attempts to dive into one of the hot pools at Norris Geyser Basin. | 
|  | A beautiful day comes to an end at Yellowstone National Park. | 
|  | Total 
           Distance:   7.3 kilometres Round-Trip Time: 2 hours 12 minutes Net Elevation Gain: 390 metres |