Sunrise at Isalo National Park, Madagascar

Sunrise at Isalo National Park, Madagascar.

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Rainforest along the Rio Napo in Peru

Rainforest along the Rio Napo in Peru.

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Long-tailed macaque in southern Thailand

Long-tailed macaque in southern Thailand

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African fish eagle at sunset over the Okavango River Delta in Bostwana

African fish eagle at sunset over the Okavango River Delta in Bostwana.

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Rainbow Ameivas lizard in Cuero y Salado Refuge on the Caribbean coast of Honduras

Rainbow Ameivas lizard in Cuero y Salado Refuge on the Caribbean coast of Honduras. With its reefs, beaches, rainforests, and Mayan ruins, Honduras is an increasingly popular destination for ecotourists.

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Reefs off the Yucatan Peninsula, Mexico

Reefs off the Yucatan Peninsula, Mexico. The 80-mile stretch of coastline south of Cancun on the Yucatan Peninsula of Mexico -- now called the Riviera Maya -- has undergone a remarkable transformation over the past decade, becoming Mexico's fastest-growing resort area. Places like Playa de Carmen and Tulum have gone from small towns to booming resort developments as developers bypass bureaucratic approvals to buy and build up beachfront lands as fast as possible. Mangrove swamps, which are largely responsible for the region's sparkling clear waters and biologically rich coral reefs, are the primary victims of land clearing for hotels and condominiums.

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Pfeiffer Burns Beach in Big Sur, California

Pfeiffer Burns Beach in Big Sur, California

Big Sur pictures