China's Zhangjiajie National Forest Park resembles something straight from your favorite sci-fi movie. Visitors can see its towering stone pillars from above by taking the world's tallest outdoor elevator or crossing the world's highest and longest glass-bottom bridge.

Zhangjiajie National Park

A population of glowworms called Arachnocampa Luminosa illuminates the Waitomo Caves on the North Island of New Zealand. These bioluminescent glowworms, which are unique to New Zealand, live along the cave's ceiling, creating the illusion of an overhead sky full of stars.

Waitomo Glowworm Caves

Salar de Uyuni in Bolivia is the world's largest salt flat, stretching more than 4,000 square miles. Devoid of wildlife or vegetation, it’s extremely flat with clear skies which create a mirror-like reflective surface in the wet season, and fascinating polygonal cracks in the dry season.

Salar de Uyuni

The remote volcanic Galapagos Islands are a uniquely preserved habitat with animals that can't be seen anywhere else in the world. More than 600 miles west of Ecuador, they are part of a national park considered by UNESCO to be a "living museum and showcase of evolution."

Galapagos Islands

On Navajo land in Arizona, Antelope Canyon is a stunning, picturesque slot canyon with colorful, wavy walls illuminated by streaming beams of light. The canyon has "upper" and "lower" portions, each with different natural lighting and formations created by erosion.

Antelope Canyon