This is today a modest park with a playground that conveniently faces onto a canal dock, but was once mainly industrial.
Waste heat from the London Underground is now being used to provide heating and hot water to more than 1,350 homes, a school and two leisure centres in Islington.
After a lengthy restoration, the Cally Clock Tower opens to the public next month, and tickets to climb up to the top are now available.
Next weekend sees an occasional opening of the Caledonian Park Clock Tower and a chance to climb the narrow steps to the very top for amazing views across North London.
Plans to reopen the derelict Caledonian Tower, with its incredible views over London have moved a step closer, after Islington Council showed off revamped plans for a visitor center.