SAN FRANCISCO -- A tall, silver, shining metal monolith discovered in the desert in southeastern Utah-- which prompted theories of alien placement and drew determined hikers to its secret location -- ...

Editor's note: The related video above was published Nov. 24. A mysterious silver monolith that was placed in the Utah desert has disappeared less than 10 days after it was spotted by wildlife ...

A mysterious silver monolith that was placed in the Utah desert has disappeared less than 10 days after it was spotted by wildlife biologists performing a helicopter survey of bighorn sheep, federal ...

A newly discovered 10-foot-tall silver monolith on a muddy bluff in Wales has reignited wild speculation on its origin after similar obelisks appeared in Utah, California, England and Romania. The ...