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The Pinnacles, Australia

The alien-looking spires of The Pinnacles were formed from limestone worn down by rain, sun and wind over millions of years.

Bernhard Richter/iStock/Thinkstock

Even if you were an artist painting a cover picture for some pulp science fiction novel, you probably wouldn't envision an alien landscape that looks weirder than The Pinnacles.

This stretch of desert landscape in Australia's Nambung National Park boasts thousands of weathered rock projections that rise out of yellow sand dunes — some topped by domes, while others form jagged, sharp-edged columns [source: Australia.com]. The spires, some of which reach 11 feet (3.5 meters) in height, are limestone formations sculpted by wind, vegetation, rain, sun and time over millions of years [source: National Geographic Traveler].

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