Castle Geyser erupting in the Upper Geyser Basin of Yellowstone National Park, Wyoming | Benny Marty/Shutterstock
Yellowstone's Grand Prismatic | Inger Eriksen/Shutterstock
Young Elk in the water of Yellowstone Lake | Jess Kraft/Shutterstock
Lower Falls, Yellowstone's most popular waterfall, located in the Grand Canyon in Yellowstone River | Benny Marty/Shutterstock
The Blue star spring | kavram/shutterstock
A herd of bison along the Firehole River | Lee Prince/Shutterstock
A hot spring at the West Thumb Geyser Basin | MARK RALSTON/AFP/Getty Images
Minerva Terrace, Mammoth Hot Springs | julius fekete/shutterstock
Fishing Cone in the West Thumb Geyser Basin | Kris Wiktor/Shutterstock
running bull elk during the winter | Russ Heinl/Shutterstock
Belgian Pool in the Upper Geyser Basin | Arterra/Universal Images Group/Getty Images
grizzly bear near the road | Pavlina Trauskeova/Shutterstock
Old Faithful erupts while tourists watch | f11photo/shutterstock