<strong>The long read</strong>: Utilitarian as they may be, some civic projects are so monumental they approach the sublime. And one of the most elegant is hidden inside a mountain in Wales
The two North Wales parks among the biggest in Britain dailypost.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailypost.co.uk Daily Mail and Mail on Sunday newspapers.