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
The woman was taken to hospital after a bungalow collapsed in Leicestershire.
Politicians from the Midlands discuss the legacy of MP Enoch Powell, the Windrush scandal, and the future of manufacturing in the region.
Camelot has revealed that the winning ticket was sold in South Kesteven in Lincolnshire and are urging players to check their tickets.