Ecosystems

Enormous sandstone towers loom within a Czech forest.

Hidden deep within a Filipino jungle is an incredible waterfall that plunges into a dazzling blue-green pool.

Ride a boat through this magnificent underground world, which now doubles as a theater.

A unique set of caves that spits waves back out into the ocean.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

This church carved into the rocks is full of enchanting stone statues.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

Surrounded by a smudge of dark earth, this isolated volcano sits in stark contrast to the surrounding Sahara.

Flames have been burning within this mountain for more than 2,500 years.

A miniature golf course crafted inside the world's largest simulated cave.

This popular cave pool is truly magical, despite the crowds.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

The largest salt lake in the Sahara is mysteriously alluring.

A remote sandstone plateau named for a legendary cattle rustler.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.