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A scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.

A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.

An adult American Eel (Anguilla rostrata) prowls along the edge of the Morrison Springs cavern at 85 feet deep watching over the adolescent eels in the clear freshwaters of the state park near Red Bay, Florida.

A school of orange basslets (Pseudanthias squamipinnis) on a healthy Fijian reef full of hard and soft corals, Fiji.

A large group of purple tube sponge sits high on the reef, Bonaire, Caribbean Netherlands.The Hilma Hooker Shipwreck is visible in the background.

Diver looks on at sponges, pink soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

Diver looks on at sponges, soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

October 19, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash and steam cloud are blown away by wind. View over industrial area of Kliuchi town with Kamchatka River in foreground.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia.
Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano.

October 15, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia.
Ash cloud and lava flow are produced by the activity of the snowcovered conical stratovolcano. Column of steam rises where lava flow is melting glacier.

October 24, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia, seen in evening light. Ash cloud is produced by the activity. Kamen volcano is seen on right.

October 21, 2013 - Nighttime view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

October 16, 2013 - Eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 16, 2013 - Nighttime eruption of Kliuchevskoi (Klyuchevskoy) Volcano, Kamchatka, Russia. Ash cloud and lava flow are produced by the activity of the volcano which is partially shrouded in cloud. Kamen volcano is seen on right.

October 21, 2013 - Nighttime moonlit view of incandescent rockfall of glowing lava down flank of lava dome of Shiveluch Volcano, Kamchatka, Russia.

Christianity, Islam and Judaism symbols, three monotheistic religions, Jewish Star of David, Christian Cross and Muslim Crescent, Indonesia

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Kofah (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. A crater wall separates Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

December 3, 2012 - Colourful crater lakes of Kelimutu volcano, Flores Island, Indonesia. Tiwu Nua Muri Koo Fai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched Lake). The two lakes are highly acidic due to underwater fumarole activity and are turqoise in colour.

September 12, 2009 - Grand Prismatic Spring, Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, terraces of potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

Scenic winding road with blue street lights leading to the Riff mountains and city of Chefchaouen (The Blue City), Morocco

African elephant (Loxodonta africana) and plain zebras (Equus quagga) at waterhole, Nxai Pan National Park, Botswana, Africa

Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.

Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.

Young women tasting Madeira Wine in cellar of the Quinta do Furao, Santana, Madeira island, Atlantic Ocean, Portugal

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal