11. Lake Baikal – Siberia, Russia

As the world’s deepest and oldest lake, Lake Baikal holds nearly 20% of Earth’s freshwater. In summer, its waters become astonishingly clear, offering visibility up to 40 meters deep. The surrounding Siberian wilderness gives the lake a raw, untouched vibe. While it lacks tropical warmth, its mesmerizing clarity and natural majesty more than make up for it. Lake Baikal is a true bucket-list destination for nature lovers and adventurous souls alike.