Taking a trip to Yellowstone National Park is like going back in time. Yellowstone is the world’s oldest national park. It was created in 1872, but aboriginal Americans have lived in the Yellowstone region for at least 11,000 years. The park is located mainly in the American state of Wyoming. Yellowstone is huge, covering an area of almost 9,000 square kilometers, with vast forests, sparkling lakes, canyons, rivers, and high mountains. It is called "Yellowstone" because the Yellowstone River flows through it.

A trip through Yellowstone can show you what America looked like before we human beings arrived. You can see large herds of bison and elk in the park. Not all of Yellowstone's wildlife is harmless. You need to be very careful in Yellowstone: the park is home to wild grizzly bears and wolves. A bear is capable of quickly killing a human and should be avoided. There are also stories of wolves attacking individuals. You should not feed bears or wolves. If you feed a wild animal, then it will be less afraid of humans and more likely to attack you and other people.

When you visit Yellowstone National Park, make sure to stop and see Old Faithful, one of the park's most amazing sights. Old Faithful is a cone geyser. Although it is not the tallest or the largest, it is the most famous of the over 10,000 natural springs and geysers in the national park. The spectacular geyser shoots boiling hot water 44 meters on average into the air about every one and a half hours. Imagine seeing that!

This famous geyser was named "Old Faithful" because of its consistent performance for members of the Washburn Expedition in 1870. Though its average interval of eruptions has lengthened over the years, Old Faithful is still as fantastic and predictable as it was a century ago.

走一趟黃石公園之旅，就好像重返過去的時光。黃石公園是全世界最古老的國家公園，創立 於1872年。美國原住民住在黃石公園地區內，已有至少一萬一千年之久。這座公園主要座落在美國懷俄明州境內，占地廣大，涵蓋的範圍將近9,000平方公里，擁有廣大的森林、明媚的湖泊、峽谷、河流和高山峻嶺。而它之所以稱為「黃石」，是因為「黃石河」貫穿其中。

一趟黃石之旅，可以體驗到美國在未有人跡前的樣貌。你可以在公園裡看到一大群野牛和麋 鹿，不過並非所有園中野生動物都是溫馴沒有攻擊性。你可得小心，黃石公園是野生灰熊和狼的棲息地，而熊有瞬間致人於死的能力，必須盡量避開。狼群攻擊人的傳聞也時有所聞，千萬不可以餵食熊或狼，因為這樣會讓牠們變得不怕人類，攻擊你或其他人的可能性也會相對提高。

如果你去參觀黃石公園，一定要拜訪園中最令人嘆為觀止的老忠實噴泉（Old Faithful）。老忠實噴泉是一座錐形的間歇性噴泉，在園內超過1萬座天然泉和間歇泉當中，它並非最高或最大的，卻是最富盛名的。這個壯觀的噴泉大約每一個半小時就會向空中噴出平均44公尺高的滾燙泉水。想像一下那番情景吧！

這個著名的間歇噴泉因為規律且反覆地噴出泉水，在1870年，華士本探險隊的成員便將之命 名為「老忠實」。雖然它間歇性的平均噴發時間已逐年延長，但老忠實仍如一世紀前那樣美麗壯觀，如期噴出泉水。