Incredible places: A window onto extraordinary landscapes on Earth

Argentina's El Ojo is said to harbor UFOs and the ghosts of ancient deities, but as far as scientists can tell, the island is simply a fluke of nature that formed through erosion and water currents.

Vietnam's Son Doong cave is so large, you could squeeze 15 Great Pyramids of Giza inside it and fly a Boeing 747 airplane through some of its passages.

Icebergs and other glacial fragments regularly wash up on Iceland's southern Diamond Beach, making the sandy strip look like a field of gemstones.

Carlsbad Caverns National Park in southeastern New Mexico is home to 119 known caves, including North America's largest cave chamber, the Big Room.

Scientists first described the flooded cave in 2016 but determined its extraordinary extent years later.

Every year, record-seeking surfers and spectators descend on the small Portuguese town of Nazaré for the "big wave" season, when water can surge up to 100 feet (30 meters) tall.

Every winter, when sunlight hits at the right angle, visitors to Virginia's First Landing State Park are treated to a mesmerizing rainbow light show courtesy of the park's bald cypress swamp.

The growing "gateway to the underworld," officially known as the Batagay megaslump, is the largest megaslump in the world and exposes permafrost layers that are 650,000 years old.

Every winter and spring, great white sharks that usually dwell off the coast of California gather in a remote section of ocean the size of Colorado — and scientists are slowly piecing together why.

Al Naslaa is a rock formation in Saudi Arabia's northwestern desert consisting of two huge, symmetrical stone blocks that are separated by a mysterious gap and sit on small pedestals.