Limestone forms the bulk of the Canadian Rockies and will wow the explorer twice. First, with its sheer, looming cliffs. Then, once eroded down to silt size particles, it will remain suspended in the water bodies of the Canadian Rockies and give them their surreal blue colour. This view from Eiffel Peak exemplifies both of those qualities and shows the cliffs of Mount Fay towering above the aquamarine waters of Moraine Lake. Banff National Park, Alberta, Canada.