Ecosystems

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

The remains of a 37,000-year-old prehistoric society were discovered in this mammoth cave, one of the largest in Asia.

This unlikely memorial honors the Canadian and Portuguese laborers who felled trees for the Allies in World War I.

Scientists use one of the saltiest bodies of water on Earth as a terrestrial base for studying water on Mars.

A whimsical village of unique treehouses resides in a Washington forest.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

A real-life replica of a home from Hayao Miyazaki's beloved movie "My Neighbor Totoro."

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

An eerie, protected forest of old-growth oak trees, many of which are now dead.