Ecosystems

Veryovkina Cave is more than 1.3 miles deep—the deepest known in the world.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

In the Hugging Tree Forest, lingonberry marshmallows, hot chocolates, and the best campfire lattes north of the Arctic Circle come to you.

A centuries-old iron mine is now a paradise for explorers, divers, and spelunkers.

A mountain cave is the site of archaeological findings and Paleolithic rock art.

An off-the-beaten path cave with an underground lake.

Deep below the dry landscape of Bahia, a cave with intense blue water to float in.

A non-native grove of 241 redwoods in Southern California.

A hyper-remote desert cave dramatized in "The English Patient."

A pair of mysterious, unusually polished cave temples with an ancient gold legend.

Was this cave created by Hercules's wrath, the devil, or volcanic activity?

Nestled in an unassuming residential area, this "forbidden forest" is rumored to spirit away those who dare enter it.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

A tangible and sobering reminder of an atrocity that took place during a secret war.