1: 1. The carved initials "J+E" on a tree near Old Faithful. 2. A hidden hot spring only accessible by a secret trail. 3. An abandoned cabin near the Lamar Valley.

2: 4. A mysterious petroglyph in the Norris Geyser Basin. 5. A rock formation that resembles a bison near Tower Fall. 6. A hidden cave behind Lower Yellowstone Falls.

3: 7. A hidden waterfall deep within the Hayden Valley. 8. An old stagecoach road near Mammoth Hot Springs. 9. A secret hot spring that only appears during the full moon.

4: 1. The hidden grave of a legendary Yellowstone explorer. 2. A hidden underground river beneath the Mud Volcano. 3. The secret location of an ancient Native American burial site.

5: 4. A hidden geocache filled with Yellowstone memorabilia. 5. A hidden meadow filled with wildflowers near the Grand Prismatic Spring. 6. A secret tunnel that leads to an untouched part of the park.

6: 7. A hidden cave painting near the Tower-Roosevelt Junction. 8. The secret location of a hidden hot pot in the backcountry. 9. A hidden camping spot with breathtaking views of the Lamar Valley.

7: 1. The hidden remains of an old ranger station near Lake Butte. 2. A hidden pet cemetery near the Norris Geyser Basin. 3. A secret waterfall that only appears during the spring thaw.

8: 4. A hidden mine shaft near the Old Faithful Inn. 5. A secret hot spring only accessible by kayak on Yellowstone Lake. 6. The hidden location of a secret ranger lookout tower.

9: 7. A hidden picnic area with sweeping views of the Grand Canyon of the Yellowstone. 8. A hidden natural arch near the West Thumb Geyser Basin. 9. The secret location of a hidden cave with ancient pictographs.