Incredible places: A window onto extraordinary landscapes on Earth

Walvis Bay in Namibia is home to the largest solar sea-salt production plant in sub-Saharan Africa. The plant is famous for its brightly colored evaporation ponds.

The Savonoski Crater is a round hole in Alaska's Katmai National Park that has defied scientific explanation ever since it was discovered.

Buried several miles beneath East Antarctica's ice, Lake Vostok is one of the largest freshwater lakes on Earth, rivaling Lake Ontario in terms of size and volume.

Trovants are rocks that grow by absorbing minerals from rainwater. Romania is home to a cluster of trovants that inspired folklore of dinosaur eggs, plant fossils and alien creations.

Upheaval Dome is a giant rock formation in southeastern Utah with two potential origin stories, although most scientists think it was created by an ancient meteor strike.

The Pamukkale travertines are limestone slopes and thermal water pools that have attracted visitors since before the days of Ancient Greece, when the spa town of Hierapolis was founded at the top.

The Bungle Bungle Range in Western Australia is a collection of rock domes forged from ancient seabeds and flanked to the northeast by a prehistoric meteor impact crater.

Antarctica is home to a peak shaped like a perfect pyramid — but contrary to what conspiracy theorists say, the mountain's four symmetrical faces were forged through natural processes.

Tristan da Cunha is a group of islands in the South Atlantic that formed from the breakup of the supercontinent Gondwana. Today, it's home to a tiny and extremely isolated farming community.

Kawah Ijen is an active volcano on the island of Java with an extremely acidic crater lake and gas emissions that produce blue flames upon contact with oxygen in Earth's atmosphere.