Ecosystems

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

What was once the largest mine in North America has left behind a hollow hill filled with bright blue waters.

The second largest in the world, this massive underground void has its own subway.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

One of the largest caverns in the world has a maw large enough to stack cathedrals in.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

This sacred cave temple is home to thousands of bats and according to legend, a giant snake king.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

While exploring the desert, you can stop by the home of a fictional heretic from a parallel universe.