Visitors looking at a fossil in the chalk walls of the Fan Bay Deep Shelter in the cliffs overlooking Dover, England, on July 23. The tunnels were built in World War II after British Prime Minister Winston Churchill visited the area and was horrified to see enemy ships moving freely in the Dover Strait. He ordered three anti- aircraft guns to be installed there. Steel-lined tunnels were added 21m below the ground to house soldiers manning the facility. The National Trust rediscovered the tunnels after buying the land in 2012 and after a major restoration project, the tunnels opened to the public on July 20.