Sahara Desert
The world's largest hot desert
Landforms
Deserts, canyons, caves, reefs, and other large-scale terrain features.
Grand Canyon
A mile-deep gash through two billion years of rock
Amazon Rainforest
The largest tropical rainforest on Earth
Mammoth Cave
The longest known cave system on Earth
Great Barrier Reef
The largest living structure on Earth
Antarctica
Earth's frozen giant at the bottom of the world
Victoria Falls
The largest curtain of falling water on Earth
Dead Sea
Earth's lowest point on land and saltiest large body of water
Old Faithful
The world's most predictable geyser
Bali
Indonesia's 'Island of the Gods,' where terraced rice paddies meet volcanic peaks
Santorini
A crescent-shaped volcanic island with blue-domed churches
Zanzibar (Unguja)
The spice island off the coast of East Africa
Maldives
The world's lowest-lying country, scattered across 1,192 coral islands
Svalbard
An Arctic archipelago where polar bears outnumber people
Faroe Islands
18 rugged islands in the North Atlantic with more sheep than people
Azores
Nine volcanic islands in the middle of the Atlantic Ocean
Seychelles
The world's smallest African country, with the oldest ocean islands