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.
Rare cave pearls fill dried-out terrace pools in Hang Son Doong.
Cavers enter Hang En, a cave tunneled out by the Rao Thuong River.
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.
Bolts are drilled for climbers to scale the Great Wall of Vietnam.
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 tornado snakes toward tornado-chasers and their van.
An F4 category tornado travels across a field at great speed.
A fiery new cone on Mount Etna upstages Sicily's night sky in 2002.
An F4 category tornado barrels across South Dakota farmland.
An F3 category tornado swirls across a South Dakota prairie.
A cave column swagged in flowstone towers over explorers in Hang Ken.
Sulphur, salt and other minerals color the crater of Dallol volcano.
Dallol Volcano, Ethiopia.
A massive F4 category tornado rampages through a field towards a road.
The lava at Nyiragongo is made of an alkali-rich volcanic rock.
Democratic Republic of the Congo.
Discs of travertine ring a twelve-foot wide hot spring.
Danikil Depression, Ethiopia.
Cavers climbing a web of gypsum crystals.
A member of the expedition walks on Nyiragongo's cooled lava floor.
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.
An F4 category tornado bears down on storm chaser Tim Samaras.
Hang Son Doong explorers navigate an algae-covered cavescape.
Molten rock cools and forms plates on the surface of a lava lake.
Doppler on Wheels radar trucks wait for tornadoes to develop.
A climber ascends Loong Con.
A tornado chaser on the road in his GPS-equipped van.
Midwestern States, United States of America.
The caravan travels amongst the dunes and palm trees of the Sahara.
Sahara Desert, Africa.
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.
A researcher rappels down into a cave wearing an ice-cooled suit.
The Hand of Dog stalagmite in Hang Son Doong Cave.
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.
Fiery lava splashes down Mount Etna.
A canyoneer descends the Black Hole of Calcutta in Claustral Canyon.
Tornado chasers in a van track an "elephant's trunk" tornado.
A storm chaser video taping a very close tornado.
Travertine chimneys tower over women seeking pasture for their goats.
Lake Abbe, Djibouti.
Heavy dark clouds foretell a possible tornado near an old homestead.
A climber on a ridge above the lava lake inside the Ertale volcano.
Erta Ale or Ertale Volcano, Ethiopia.
A volcanologist probes fumaroles on a sulfur-encrusted crater.
Mutnovsky Volcano, Kamchatka Peninsula, Russia.
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.
Carsten Peter discovers an oasis in the middle of the Sahara desert.
Lightning strikes zigzag above a storm chaser vehicle.
Southwest, United States.
A funnel cloud reaches towards earth from the sky.
A climber ascends eroded and dissolved limestone in the Stone Forest.
A ground fire ignited by a lightning storm.
Elephant Butte, New Mexico.
A climber scales Moon Hill, an arch from the remains of a collapsed cave.
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 microbiologist underneath the blue dome of an ice cave.
Ross Island, Antarctica.
A researcher with a pristine crystal inside Cueva de los Cristales.
A fiery lava lake in Nyiragongo's crater.
The setting sun lights a lenticular cloud over Kamchatka Peninsula.
Kamchatka Peninsula, Russia.
A lake inside a volcano crater south of Lake Abbe.
Streams of light unveil stalagmites on the floor of Hang Loong Con.
A lake of molten lava inside the volcano's crater.
Ertale Volcano, Ethiopia.
The Nyiragongo expedition's cooking tent on the rim of the volcano.
The expedition's photographer tests a thermal suit near Nyiragongo's lava lake.
Rescuers find a photograph of a tornado in the ruins left by a storm.
Manchester, South Dakota.
This may be the closest photograph ever taken of a tornado.
A cave explorer climbs through one of the Madre de Dios Island caves.
Madre de Dios Island, Chile.
Time exposure of flowing lava.
Ol Doinyo Lengai, Tanzania, Africa.
A scientist in full thermal suit captures an Etna explosion digitally.
Cascading water in Hang Son Doong.
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