Yellowstone National Park

The world's first national park, Yellowstone was established in 1872 and despite its popularity today, most of the park still remains an undeveloped wilderness of magnificent mountain scenery, waterfalls, alpine lakes and rivers. It is renowned for its geothermal wonders and abundance of wildlife. Spilling over into Wyoming and Idaho, the enormous park is situated on top of the Yellowstone Caldera, a collapsed volcanic crater that was formed 600,000 years ago and holds within it the greatest geothermic area in the world. This unique environment includes features such as exploding geysers, thousands of steaming fumaroles, hot springs and bubbling mud pools, and is where the park's most famous attraction, the Old Faithful Geyser is to be found, drawing thousands of tourists to witness its regular eruption of steaming water.

Yellowstone is also home to the largest concentration of wildlife in lower USA, including grizzly and black bears, wolves, moose, and large herds of bison and elk. The two narrow waterfalls of the Grand Canyon of the Yellowstone River cut a striking picture in the yellow-coloured rock that gives the park its name, with superb views and hiking trails for all abilities. The large alpine Yellowstone Lake fills the eastern part of the caldera and offers opportunities for boating and fishing expeditions in summer. All places of interest are accessible along the loop roads, but the intensity of visitors in summer, especially between July and August, means that one needs to hike away from the main paths to experience the true wilderness of Yellowstone National Park.

Website: www.nps.gov/yell

Telephone: (307) 344 7381

Transport: A bus service from Bozeman to West Yellowstone is available all year. Commercial transportation from Bozeman to Gardiner is available during the winter and summer seasons

Opening times: The five major visitor centres are open in summer only, generally from 8am to 7pm daily, except the Albright Visitor Center, which is the largest and is open year-round with reduced hours in winter. Of the park's five entrances, the North Entrance near Gardiner is the only one that remains open year-round to traffic. Some areas and roads are not accessible during winter.

Admission: $25 (vehicle), $20 (snowmobile or motorcycle), $12 (individual hiker or cyclist). Valid for seven days for both Yellowstone and Grand Teton National Parks.