The Grand Canyon is celebrating a big milestone this year, as it is officially 100 years old.

On Feb. 26, 1919, Congress passed legislation backed by President Woodrow Wilson recognizing the canyon as a national park. The natural wonder has become an American symbol and a space for visitors to connect with the raw outdoors. The scenic landscape holds both the heritage and culture of America's first people and a collection of unique historical and geological records.

The canyon, primarily carved by the Colorado River over the past 6 million years, stretches 277 miles through the Arizona desert. The 1,904-square-mile park draws 6 million tourists a year exploring the river rapids, the hiking trails, and its incredible geological and cultural history.

Tourists, geological researchers, and photographers alike go to experience the UNESCO World Heritage Site—that includes renowned landscape photographer Ansel Adams who helped fuel the environmental movement and helped convince government officials to take land preservation seriously.

The National Park Service is hosting a Founder’s Day Centennial Celebration with cultural demonstrators from traditional tribes, a concert by Flagstaff School District Choir, and speeches from the park’s staff.

Check out the gallery above to see a glimpse inside the rich 100-year history of the Grand Canyon.

今年对于美国科罗拉多大峡谷来说是一个重要的里程碑，大峡谷国家公园正式迎来了它的100岁生日。

1919年2月26日，在时任美国总统伍德罗·威尔逊的支持下，美国国会以法律形式将大峡谷确认为国家公园。这一自然奇观已经成为了美国的一个符号，它也让游客有了与大自然亲密接触的机会。这里保留了美洲本土先民的遗产和文化，同时也有它独特的历史传说和地理景观。

大峡谷是由科罗拉多河历经600万年的漫长岁月雕刻而成的，它绵延277英里，横穿亚利桑那沙漠，总面积达1904平方英里。大峡谷每年吸引着600万游客来此搏击激流、徒步远足，以及探索它雄奇的地理景观和历史文化。

作为被联合国教科文组织认定的世界遗产，大峡谷吸引了不计其数的游客、地理学家和摄影师，其中包括著名的风景摄影师安塞尔·亚当斯。亚当斯也是美国环保运动的先行者之一，在他的奔走呼号下，一批美国政府官员开始认真地思考环保问题。

为了庆祝大峡谷国家公园建立100周年，美国国家公园管理局将举办一场盛大庆典，游客将能看到来自于当地传统部落的文化展示，欣赏到弗拉格斯塔夫学校合唱团的演唱会，并且有机会听到公园工作人员亲自讲述大峡谷的秘密。

从下面的一幅幅照片中，你也能一窥大峡谷国家公园走过的百年历史。