During the Cold War, this bunker was built as an auxiliary hospital.
The overlying school was opened in the 60s while the hospital was officially inaugurated in the 80s.
It offered 2,370 places and never went into operation.
At the turn of the millennium, it was relieved of its responsibilities, the inventory transferred to other states, and the hospital will be soon demolished.
Pool Parc, near Ruthin, dates back to the 16th Century when it was home to the Salesbury family and the manor house was rebuilt for William Bagot, 2nd Baron Bagot, in the 1820s.
It was apparently lost in a bet by the Bagot family and it was later sold to the District Health Authority, becoming a convalescent home and then an asylum, used as an overspill for North Wales Hospital in Denbigh before closing in 1989.
Have also found an old pic of what it looked like in better times
It is very dark inside and if you are doing the upper floors take a good torch as someone has removed the odd tread in the temporary staircase