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Mount Rundle in the Rockies. The mountain could almost be called its own range, as it covers 12 kilometres with a series of peaks.

The highest peak of the Rockies is Mount Robson, which reaches nearly 4,000m high.

The steep sides of the Canadian Rockies have been worn away by erosion over millions of years.

It is possible to see bands of different kinds of rock distinguished by their different colours in the side of the mountains. Piles of scree, weathered rock that has broken away, lie at the base of the mountains.

From the air, the effect of weathering, glaciation and erosion on the mountains is clear, with the jagged-edged peaks and deep valleys.

Glaciers still cover some of the higher peaks of the Rockies.

Maligne Lake, deep in the Rocky Mountains. The high peaks are lost under clouds.

The breathtaking Rocky Mountains reflected in Maligne Lake.

The Rocky Mountains provide some of the most spectacular views on Earth.

The wilderness of the Rockies that remain virtually untouched by humans.

The depths of the valleys in the Rocky Mountains are made all the more impressive by the steepness of the surrounding mountains.

The Rockies are clearly distinguished from the Columbia Mountains to the west by the almost straight dividing line of the Rocky Mountain Trench.

The jagged snow-capped peaks of the Rocky Mountains.

The Rocky Mountain Trench from the air: the trench was gouged out of the Earth's surface by many glaciers. The trench is now so big it can be seen from Space.

The Rocky Mountain Trench is clearly visible running down the length of the Rocky Mountains, from the top of the image to the centre.

Bighorn sheep are among the large mammals that live in the Rocky Mountain Trench. This animal has a tracking device around its neck.

The walls of the Rocky Mountain Trench rise steeply up into breathtaking mountain peaks.

Home to many of Canada's largest mammals, such as the elk, the Rocky Mountain Trench is known as the 'Serengeti of North America'.

The size of the Rocky Mountain Trench is apparent from the air. Though it isn't very deep, the trench is enormous and visible from space.

The straight scar in dividing the Rocky and Columbia Mountains, the Rocky Mountain Trench, shown in red.

The very north of the Rocky Mountain Trench in Yukon Territory.

The Canadian Rockies, bordered to the west by the Rocky Mountain Trench (to the bottom left).

Banff, a town set deep in a valley that runs parallel to the Rocky Mountain Trench.

The town of Golden, British Columbia, in the heart of the Rocky Mountain Trench.

The view over the Rocky Mountain Trench. The mountains stop and start abruptly on either side of the trench, forming the clean straight line of the valley walls.

Moose are the largest land mammals in Canada, and many live in the Rocky Mountain Trench.

1886 - A freight train coming out of a tunnel through the Rocky Mountains.

Kicking Horse is one of the routes through the Rocky Mountains.

The Canadian Pacific Railway is still in use today transporting freight and passengers across Canada.

The Trans-Canada Highway snaking its way through and over the Rocky Mountains.

The Trans-Canada Highway crosses the Rocky Mountains as it connects Canada's east and west coasts.

1883 - The railway line was constructed quickly through the mountains, resulting in several temporary lines that were too steep and dangerous.

Driving deep into the Rocky Mountains is the Trans-Canada Highway, one of the longest roads in the world.

Mount Robson, the highest mountain in the Canadian Rockies, towers imposingly ahead of the Trans-Canada Highway.

Big Hill, one of the steepest railway lines ever, was operational for 25 years causing a number of accidents, until it was finally closed down.

Canadian Pacific Railway bridges deep in the Rocky Mountains.

Rail travel is a good way to see the Rockies at their best. This is a Canadian Pacific passenger train.

1885 - A work train travelling through the Rocky Mountains on the Canadian Pacific Railway.

The Canadian Pacific Railway line crosses some of the most picturesque landscape in Canada.