
Yellowstone: Our first national park —
Yellowstone National Park was the nation's first national park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. It's predominantly in Wyoming but also touches Idaho and Montana. Check in next week for Arches National Park.

Yellowstone: Our first national park —
Old Faithful Geyser may be the most-famous "resident" of Yellowstone National Park, but park ranger Dan Hottle says there is much more to see at the 2.2 million-acre park.

Yellowstone: Our first national park —
Meet our Yellowstone National Park ranger, Dan Hottle, and his 4-year-old son, Calder, shown here at Joffe Lake near the park's headquarters in Mammoth Hot Springs, Wyoming.

Yellowstone: Our first national park —
Grand Prismatic Spring is Hottle's favorite spring in the park, and it's in Midway Geyser Basin about five miles from Old Faithful. When the light is right, hike up one of the mountains surrounding the spring and you'll see the steam change colors because of the spring's bacteria.

Yellowstone: Our first national park —
There's a good chance of spotting wolves on the drive to the Lamar Valley, Hottle says. He likes to stop at a pullout about halfway to the valley and hike into the woods, where he can sometimes see a wolf or its pack. (Hottle found this wolf in his backyard.)

Yellowstone: Our first national park —
Rangers plead with with visitors to pull off the road to shoot pictures of bison (shown here in the Lamar Valley) or other wildlife that call Yellowstone home. Travelers have been known to stop their cars in the middle of the road to look at the view, or worse: look sideways to admire the nature while driving.

Yellowstone: Our first national park —
In elk mating season, which starts around September, the bulls come down from the mountains and gather up as many cows (female elk) as they can into harems. Shown here is a harem of 27 cows resting in Mammoth Hot Springs near the town post office. Visitors are cautioned to stay at least 25 yards away from the elk, which have been known to ram cars and trap people.

Yellowstone: Our first national park —
Hottle recommends that hikers travel in groups of at least three, stay on designated trails, carry bear pepper spray and make noise as they hike to avoid surprising bears (mother bears can attack when surprised). He and his family have hiked "every inch" of Electric Peak, a nearly 11,000-foot mountain.

Glacier National Park —
Hottle also loves visiting Glacier National Park in Montana, a nine-hour drive by car. "There's a wildness about Glacier that makes it even more dangerous and adventurous than Yellowstone," he said. Glacier's Wild Goose Island is shown here.