Mammoth ferns flourish between the narrow walls of Claustral Canyon.
New South Wales, Australia.
CARSTEN PETER/National Geographic Creative
Hang Son Doong may be the world's biggest subterranean passage.
Phong Nha Ke Bang National Park, Vietnam.
A jungle grows inside Hang Son Doong.
Massive beams of selenite dwarf explorers in the Cave of Crystals.
Naica, Chihuahua, Mexico.
CARSTEN PETER/ SPELEORESEARCH & FILMS/National Geographic Creative
A rock formation shines beneath a skylight in Hang Son Doong.
A massive F4 category tornado rampages towards a storm chaser's van.
Near Manchester, South Dakota.
Cavers enter Hang En, a cave tunneled out by the Rao Thuong River.
Rare cave pearls fill dried-out terrace pools in Hang Son Doong.
Lights of Catania are outstretched beneath an erupting Piano del Lago.
Piano del Lago, Mount Etna, Sicily Italy.
A scientist in full helmet and thermal suit collects lava samples.
A cascading waterfall in Hang Son Doong.
A tornado barrels down a road towards tornado chaser Tim Samaras.
An F4 category tornado barrels down a rural South Dakota road.
Massive beams of selenite dwarf an explorer in the Cave of Crystals.
A scientist in a thermal suit and helmet collects samples of lava.
Mount Etna, Sicily, Italy.
A fiery new cone on Mount Etna upstages Sicily's night sky in 2002.
A tornado snakes toward tornado-chasers and their van.
An F4 category tornado travels across a field at great speed.
An F4 category tornado barrels across South Dakota farmland.
Bolts are drilled for climbers to scale the Great Wall of Vietnam.
An F3 category tornado swirls across a South Dakota prairie.
A cave column swagged in flowstone towers over explorers in Hang Ken.
The lava at Nyiragongo is made of an alkali-rich volcanic rock.
Democratic Republic of the Congo.
Sulphur, salt and other minerals color the crater of Dallol volcano.
Dallol Volcano, Ethiopia.
Cavers climbing a web of gypsum crystals.
A member of the expedition walks on Nyiragongo's cooled lava floor.
A massive F4 category tornado rampages through a field towards a road.
Discs of travertine ring a twelve-foot wide hot spring.
Danikil Depression, Ethiopia.
A storm chaser plants a weather probe in the path of a tornado.
Near Woonsocket, South Dakota.
A rare mother ship cloud formation moves across the Texas Panhandle.
Near Childress, Texas.
Molten rock cools and forms plates on the surface of a lava lake.
An F4 category tornado bears down on storm chaser Tim Samaras.
Hang Son Doong explorers navigate an algae-covered cavescape.
A climber ascends Loong Con.
A tornado chaser on the road in his GPS-equipped van.
Midwestern States, United States of America.
Doppler on Wheels radar trucks wait for tornadoes to develop.
The silhouette of two scientists standing next to Mount Etna, an active volcano spitting out fire sparks and discharging rivers of lava.
Mt. Etna, Sicily, Italy.
The Hand of Dog stalagmite in Hang Son Doong Cave.
A researcher rappels down into a cave wearing an ice-cooled suit.
The caravan travels amongst the dunes and palm trees of the Sahara.
Sahara Desert, Africa.
A total solar eclipse takes place in France.
A tornado with blue sky backdrop.
United States of America.
Scientists stand close to the action during Etna's 2002 eruption.
A camel caravan crosses a landscape of sculpted sand dunes.
A caver explores Hang Ken with its shallow pools.
A canyoneer descends the Black Hole of Calcutta in Claustral Canyon.
Fiery lava splashes down Mount Etna.
Tornado chasers in a van track an "elephant's trunk" tornado.
Travertine chimneys tower over women seeking pasture for their goats.
Lake Abbe, Djibouti.
A volcanologist probes fumaroles on a sulfur-encrusted crater.
Mutnovsky Volcano, Kamchatka Peninsula, Russia.
Heavy dark clouds foretell a possible tornado near an old homestead.
An abstract of cracked Arctic sea ice.
Franz Josef Land, Russia.
Nose to nose with a camel, Carsten Peter zooms in for a little fun.
Sahara desert, Africa.
John Hare leads a carvan along an old slave trade route in the Sahara.
Sahara Desert, Libya.
A climber on a ridge above the lava lake inside the Ertale volcano.
Erta Ale or Ertale Volcano, Ethiopia.
A storm chaser video taping a very close tornado.
Lightning strikes zigzag above a storm chaser vehicle.
Southwest, United States.
Carsten Peter discovers an oasis in the middle of the Sahara desert.
A ground fire ignited by a lightning storm.
Elephant Butte, New Mexico.
A funnel cloud reaches towards earth from the sky.
A climber ascends eroded and dissolved limestone in the Stone Forest.
Canyoneers and midday shafts of light in Rocky Creek Canyon.
Ol Doinyo Lengai Volcano glows bright orange in the twilight hours.
Ol Doinyo Lengai Volcano, Tanzania.
A dromedary camel is silhouetted in the sunset of the Sahara desert.
A climber scales Moon Hill, an arch from the remains of a collapsed cave.
A fiery lava lake in Nyiragongo's crater.
Streams of light unveil stalagmites on the floor of Hang Loong Con.
The setting sun lights a lenticular cloud over Kamchatka Peninsula.
Kamchatka Peninsula, Russia.
The expedition's photographer tests a thermal suit near Nyiragongo's lava lake.
A lake inside a volcano crater south of Lake Abbe.
A researcher with a pristine crystal inside Cueva de los Cristales.
A microbiologist underneath the blue dome of an ice cave.
Ross Island, Antarctica.
A lake of molten lava inside the volcano's crater.
Ertale Volcano, Ethiopia.
Rescuers find a photograph of a tornado in the ruins left by a storm.
Manchester, South Dakota.
The Nyiragongo expedition's cooking tent on the rim of the volcano.
Cascading water in Hang Son Doong.
A cave explorer climbs through one of the Madre de Dios Island caves.
Madre de Dios Island, Chile.
This may be the closest photograph ever taken of a tornado.
Time exposure of flowing lava.
Ol Doinyo Lengai, Tanzania, Africa.
A scientist in full thermal suit captures an Etna explosion digitally.
/National Geographic CreativeSee More Images by this Photographer
Dimensions: px x pxMax File size: MB
Privacy / Terms / Contact Us
Copyright © 1996-2015 National Geographic Society. Copyright © 2005-2017 National Geographic Partners, LLC. All rights reserved.