Yellowstone visitors have several options for paying an entrance fee to get into the park or even getting in free.

Only have two days? Make the most of your time by visiting some of our favorite spots in the park.

Nowhere in the Lower 48 is there more abundant wildlife than in the greater Yellowstone region. Yellowstone National Park is home to the largest concentration of large and small mammals, and most of the species in the park also inhabit regions of Grand Teton National Park and the states of Wyoming, Montana, and Idaho.

Old Faithful may be more famous, but the Grand Prismatic Hot Spring is the most photographed thermal feature in Yellowstone. That's because of its crazy-bright colors and enormous size.

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Giant waterfalls pierce the Yellowstone River while pastel colors mark the locations of hot springs and steam vents in the canyon walls.

Do the All-American Road Trip starting in the Midwest.

Do you know where you're going?

Only have two days? Here's what to do.

Planning a vacation to Yellowstone involves many details, one of which is deciding how you will enter the park.