Photos: There's more to Yellowstone geothermal than Old Faithful

Driving through Yellowstone National Park, there is no cell phone signal. After all, you're deep in the wilderness. Until you get to the area around Old Faithful, Yellowstone's signature geyser. There, you can get a full five-bars signal, and as the geyser goes off, you can look around and see dozens of people explaining it live to friends via their phones.

That's because for many people, Yellowstone and Old Faithful are one and the same. But in fact, the park, America's first National Park, is brimming with other geothermal delights. Whether it's other large geysers, deeply colored hot pools, hot springs, mud pots or steam vents, Yellowstone is a geothermal fan's best bet for being able to see the best of what nature has to offer, all in one place.

Here, the White Dome geyser goes off, as it does at irregular intervals. Many of the park's geysers go off on regular schedules, though Old Faithful--it's called that for a reason--may well be the most reliable.

CNET News reporter Daniel Terdiman visited Yellowstone on Road Trip 2009 to get a look at the park's other geothermal activity. But of course, he had to stop in to see Old Faithful do its thing.

Click here for the entire Road Trip 2009 package.