Without any human influence, nature has created extraordinary wonders - from majestic mountains and bubbling volcanoes to amazing plants and animals. These wonders are found across all the continents and oceans of this planet. In a tour of the seven greatest wonders of the Arctic, Antarctica, and the oceans, we'll encounter the Mariana Trench. This Pacific Ocean trench includes the deepest point on Earth's surface, a dark abyss that lies miles below familiar ocean life. Just off the coast of Australia, we'll see the Great Barrier Reef, the world's largest reef system. It is packed with colorful corals, stealthy sharks, giant clams, exotic plants, and much more. We'll also discover the ends of the Earth, literally - the North and South poles. What other natural wonders do the Arctic, Antarctica, and the oceans hold? to find out, we'll explore undersea chimneys, an ocean expressway, and the world's highest tides in fascinating detail.