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Tucked away in the mountainous region of Siberia is Lake Baikal, the deepest lake in the world.

The water is regarded as some of the most pristine on Earth, crisp and clear. On a good day, you can see more than 120 feet into the water. That's like peering from the roof of a 12-story building.

But this prehistoric lake, which is 20-25 million years old, is more than 5,300 feet deep at its deepest point. Don't drop your goggles.

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