Embark on a journey through time as you stand on the rim of Arizona's natural wonder, the Grand Canyon National Park. 105 years have passed since President Woodrow Wilson signed the designation of the national park in 1919. The origin of the Grand Canyon—an exceptional landscape formed by the river, wind and landslides—dates back between 5 and 6 million years ago. The canyon holds the stories of Native Americans, European and American pioneers and travellers, along with geological wonders including steep valleys and colourful rock formations. All of these areas are supervised by the National Park Service. In addition to tourist adventures such as cruising on the Colorado River, joining the Trail of Time walking tour or climbing up to the Desert View Watchtower, the park is also a UNESCO World Heritage Site and a registered International Dark Sky Park for crystal-clear stargazing.