7. Crater Lake – Oregon
The Crater Lake in Oregon is yet another lake offering the clearest waters for all the swimmers and divers in the world. One of the most ancient lakes of the world, the Crater Lake is also popularly known as ‘Old Man of the Lake’. The beautiful, clear and pristine waters of this amazing tourist destination house a tree at its center which is present at the spot for more than 100 years now. The lake was formed thousands of years ago when a volcano named Mount Mazama collapsed. Now that’s a real treat to any traveler’s mind and eyes, isn’t it?