arizona 's the wave and the fairy chimneys in turkey were formed by layers of rock and erosion .
it was n't a stretch for iceland 's svinafellsjokull glacier to co-star as ` space ' in interstellar .
grand prismatic spring in yellowstone national park looks like a volcano about to explode .
the zhangye danxia landform in china are hills that take on all the colours of the rainbow .