Moraine Lake

Moraine Lake is one of the most famous lakes in Canada (it even appears on the $20 bills). It's located in Banff National Park in the Valley of the Ten Peaks, only a few miles from Lake Louise. The attention-grabbing blue color is caused by rock flour in the water and is characteristic of many lakes in the region. There's a small hill nearby that you can scale to get a great panoramic view of the lake.

I've seen this lake a thousand ways: with sun, covered in ice, with snowy mountains in the background, with fog. It's always an amazing place. I could spend hours just gazing. My recommendation is to visit early in the morning, when there are not many people and sunlight lights up the mountains.