California monolith emerges after Utah and Romania works disappear

The mysterious silver monolith that was placed in the Utah desert has disappeared less than 10 days after it was spotted by wildlife biologists (Utah Department of Public Safety/AP)

Days after the discovery and swift disappearance of two shining metal monoliths spotted half a world away from each other, another towering structure has popped up – this time at the pinnacle of a trail in Southern California.

Its straight sides and height appear similar to one discovered in the Utah desert and another that was found in Romania.