Visitors are now able to stroll through the now-defunct Leicester-Swannington Railway tunnel and discover the history behind the historic structure.
The Glenfield Tunnel, built in the early 1800s, runs for a mile beneath Leicester's streets and has been closed since 1966.
David Lyne, from the Leicester Industrial Historical Society gave the group a guided tour of the tunnel, explaining its history and the project which has brought it back to life.
Leicester City Council bought it for just £5, and spent £500,000 restoring its crumbling walls to meet safety standards.
More top news
Forty people will be sleeping rough tonight in Wolverhampton to raise money for the homeless.
By day he is an ordinary barman pulling pints in Birmingham. But by night he is Spiderman, scaling the city's streets feeding the homeless.
Research suggests the Midlands is the pie-eating capital of the UK...!