A highway has been shut down after a huge sinkhole appeared in the middle of the road - and a hundred-year-old railroad is to blame.
The sinkhole, which is 20ft wide and stretches 100ft into the earth, opened up on Monday in the Colorado mountains.
Officials now say it is the result of an underground railroad tunnel built in the 19th century which collapsed several decades ago.
The U.S. 24 highway has been partially closed between Leadville and Minturn ever since the sinkhole appeared, and state officials warn that it is unlikely to re-open any time soon. Read More