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Lisbon, Portugal, Date Unknown Photograph by W. Robert Moore A photograph from the 1930s highlights the dramatic angles and steep streets of Portugal's capital city. Perched between seven hills, Lisbon was built by seafarers where the Tagus River empties into the Atlantic Ocean and was once Europe's wealthiest capital and the center of world exploration.

Gabon, 1999 Photograph by Michael Nichols J. Michael Fay of the Wildlife Conservation Society holds a chameleon. Fay endured a yearlong trek across African forests from Congo to Gabon, surveying the region's still pristine landscape.

North Dakota, United States, Early 1900s Photograph by Edward S. Curtis Portrait of Spotted Bull, a member of the Mandan Indian tribe. His tribe was unusual for its sedentarism. Plains tribes were commonly nomadic.

Littleton Island, Greenland, 1925 Photograph by Donald B. MacMillan "Eight exposures on the same photographic plate, made at 20-minute intervals, capture the midnight sun over Littleton Island near Greenland."

大海辛苦了!视觉盛宴~

Addis Ababa, Ethiopia, 1999 Photograph by Jodi Cobb A cluster of ornate umbrellas enlivens a dreary day in Addis Ababa as a crowd of people lines up outside a church. At 8,000 feet (2,400 meters) above sea level, Ethiopia’s capital city is the highest in Africa. The population is almost evenly split between Christians, living in the highlands, and Muslims inhabiting the lowlands.

Sitkoh Bay, Tongass National Forest, Alaska, 1998 Photograph by Michael Melford When the tide goes out, a starfish is exposed to the elements in Tongass National Forest. A popular spot for tourists along the Inside Passage, the Tongass is the largest remaining temperate forest in the world—even as the logging industry lobbies for greater access to it. (Text adapted from and photograph from "A Wilder Passage," May/June 1999, National Geographic Traveler magazine) RELATED Photo gallery: Alaska's Kodiak Island

Santa Fe River, Florida, 1998 Photograph by Wes Skiles "Dive through a hole in the bed of the Santa Fe River and disappear into the darkness of the Devil's Ear. It's just one portal of hundreds in Florida leading to a watery underworld that explorers are slowly bringing to light."

Ginnie Spring, Florida, 1998 Photograph by Wes Skiles "Brown and blue blend as water from Ginnie Spring mixes with river water tinted by plant tannins. While this natural dye is harmless, man-made pollution clouds the future of these fountains—a fact Floridians must now confront."