Know Before You Go
Head throught the centre of Denbigh Town and look for signs to the Castle. Park up at the Castle for free or on the road below.
After parking, follow the road down towards the outskirts of town and you will come to the main gates of Denbigh Asylum - to avoid attention (the house opposite the gates have dogs), walk a little further up the road, past the next house with the aviary in the front driveway, and take the first right onto a dirt path in a little wooded area a little further on from the house; walk down this path up this and don't be tempted to climb at the first reasonable looking gap in the hedge above the wall, there are better gaps in the hedges and lower wall a little further down. Climb up a dry stone wall and you are now within the grounds of this rather magnificent place.
Take note that signs warn of Asbestos on site, so take a dust mask and eye protection if you intend to have a good nose around inside. Signs also warn of CCTV on site. Site is marked as private property and 'trespassers will be prosecuted' warning signs are visible in at least two locations from the road.