Experts are not sure whether this tribe placed bodies in caves as part of burial ceremonies or for other reasons.

VOA: special.2010.11.10

Guides explain that it did not result from the action of water and streams like other limestone caves.

VOA: special.2009.12.07

Bones,hair,feathers, even the remains of plants have been found in deep, dry caves high in the rock walls.

VOA: special.2009.10.07

Later,the water and most of the acid left the caves as the Guadalupe Mountains continued to rise.

VOA: special.2009.12.07

Carlsbad Caverns National Park contains more than one hundred caves below the surface of the desert.

VOA: special.2009.12.07

These minerals became the formations and shapes on the ceilings, walls and floors of the caves.

VOA: special.2009.12.07

But anyone can visit the main attraction, one of the largest caves in the world.

VOA: special.2009.12.07

But some experienced cavers are permitted to explore five "wild" caves in the park.

VOA: special.2009.12.07

Two major caves are open to the public near Smoke Hole and Seneca Rocks.

VOA: special.2009.07.20

They climb ladders to enter some of the caves that were homes centuries ago.

VOA: special.2010.07.05

Guides lead groups on lighted paths down into the ground and through the caves.

VOA: special.2009.07.20

The researchers made their discoveries last year in two caves in southwestern Germany.

VOA: special.2009.08.18

So studying the organisms in these oxygen-free caves gives clues about the past.

VOA: special.2010.11.10

In nineteen twenty-three, scientists from the National Geographic Society explored the caves.

VOA: special.2011.04.11

All of these landmarks are sitting among hills and caves and bridges.

VOA: special.2010.12.20

At the same time, he explored much of the caves.

VOA: special.2009.12.07

Now these caves provide underground experiences for visitors.

VOA: special.2009.07.20

It's home to some of the most ancient Christian monasteries, and its natural caves or 'hermitages,' were used as shelters and burial grounds going back more than 10,000 years.

VOA: standard.2010.08.05