There is a cave in the world which has its own ecosystem. This cave has a forest, river, rocks, trenches and much more. It was declared the world's largest cave in 2009.

George H. Crosby Manitou State Park is home to one of the most impressive and overlooked old-growth forests in Minnesota ...

Today, visitors can explore the cave's cool, dark expanse by making a trek to the Coconino National Forest. The cave is open year-round, but roads may be closed in winter, making it temporarily ...

The Hiawatha National Forest is one of the most magical places in the US; we're incredibly lucky to be able to call it ours ...

This cave on a hillside near Tarbox Pond may have been a winter shelter for the Narragansetts. Find out why it's also known as "Witch's Cave." ...

The Odisha forest department, in a bid to attract tourists to Debrigarh Sanctuary in western Odisha, launched a cave trek package to Bhuimamandali for tourists interested in exploring the ...

This story appears in the February 2012 issue of National Geographic magazine. She is lying in a cave, dying. Legs and arms but knobby sticks, Lidia Maiyu is curled up close to the campfire.

Whether it's a cruise around the Galápagos Islands, a tree house stay in the Amazon rain forest, or a trek in the Himalayas, nature travel gives you unforgettable sights and experiences.

Highlights include the magnificent oculus – a popular photo spot – which lets in natural light into the cavernous space; the Drunken Forest and Cave Pearls sections that reference rock ...